3. As shown in Figure 1, in Tamara's garden, there are 3 rows and 2 columns of rectangular flower beds, totaling six beds, each 6 feet long and 2 feet wide. These flower beds are separated by 1-foot-wide walkways, and there is also a 1-foot-wide walkway around the perimeter of the garden. What is the total area $S$ of the walkways in square feet?
(A) 72
(B) 78
(C) 90
(D) 120
(E) 150
3. B.
$$
\begin{aligned}
S= & (1+2+1+2+1+2+1) \times \\
& (1+6+1+6+1)-6 \times 6 \times 2 \\
= & 150-72=78 .
\end{aligned}
$$