The graph below shows a portion of the curve defined by the quartic polynomial $ P(x) \equal{} x^4 \plus{} ax^3 \plus{} bx^2 \plus{} cx \plus{} d$. Which of the following is the smallest?

$ \textbf{(A)}\ P( \minus{} 1)$
$ \textbf{(B)}\ \text{The product of the zeros of }P$
$ \textbf{(C)}\ \text{The product of the non \minus{} real zeros of }P$
$ \textbf{(D)}\ \text{The sum of the coefficients of }P$
$ \textbf{(E)}\ \text{The sum of the real zeros of }P$
[asy]
size(170);
defaultpen(linewidth(0.7)+fontsize(7));size(250);
real f(real x) {
real y=1/4;
return 0.2125(x*y)^4-0.625(x*y)^3-1.6125(x*y)^2+0.325(x*y)+5.3;
}
draw(graph(f,-10.5,19.4));
draw((-13,0)--(22,0)^^(0,-10.5)--(0,15));
int i;
filldraw((-13,10.5)--(22,10.5)--(22,20)--(-13,20)--cycle,white, white);
for(i=-3; i<6; i=i+1) {
if(i!=0) {
draw((4*i,0)--(4*i,-0.2));
label(string(i), (4*i,-0.2), S);
}}
for(i=-5; i<6; i=i+1){
if(i!=0) {
draw((0,2*i)--(-0.2,2*i));
label(string(2*i), (-0.2,2*i), W);
}}
label("0", origin, SE);[/asy]
To determine which of the given values is the smallest, we need to evaluate each option based on the given polynomial \( P(x) = x^4 + ax^3 + bx^2 + cx + d \).

1. **Evaluate \( P(-1) \):**
   \[
   P(-1) = (-1)^4 + a(-1)^3 + b(-1)^2 + c(-1) + d = 1 - a + b - c + d
   \]
   From the graph, it is given that \( P(-1) = 4 \).

2. **The product of the zeros of \( P \):**
   By Vieta's formulas, the product of the zeros of a polynomial \( P(x) = x^4 + ax^3 + bx^2 + cx + d \) is given by \( (-1)^4 \cdot d = d \). From the graph, it is given that \( d = P(0) > 5 \).

3. **The product of the non-real zeros of \( P \):**
   Let the zeros of \( P \) be \( r_1, r_2, r_3, r_4 \). Suppose \( r_1 \) and \( r_2 \) are the real zeros, and \( r_3 \) and \( r_4 \) are the non-real zeros. The product of all zeros is \( d \), and the product of the real zeros is \( r_1 \cdot r_2 \). Therefore, the product of the non-real zeros is:
   \[
   \frac{d}{r_1 \cdot r_2}
   \]
   Given \( d > 5 \) and \( r_1 \cdot r_2 < 6 \), we have:
   \[
   \frac{d}{r_1 \cdot r_2} < \frac{6}{5}
   \]

4. **The sum of the coefficients of \( P \):**
   The sum of the coefficients of \( P \) is \( P(1) \):
   \[
   P(1) = 1 + a + b + c + d
   \]
   From the graph, it is given that \( P(1) > 1.5 \).

5. **The sum of the real zeros of \( P \):**
   By Vieta's formulas, the sum of the real zeros of \( P \) is given by \( -a \). From the graph, it is given that the sum of the real zeros is \( > 4 \).

Comparing all the values:
- \( P(-1) = 4 \)
- The product of the zeros of \( P \) is \( d > 5 \)
- The product of the non-real zeros of \( P \) is \( < \frac{6}{5} \)
- The sum of the coefficients of \( P \) is \( P(1) > 1.5 \)
- The sum of the real zeros of \( P \) is \( > 4 \)

The smallest value among these is the product of the non-real zeros of \( P \), which is \( < \frac{6}{5} \).

The final answer is \( \boxed{\text{The product of the non-real zeros of } P} \).