Which number is larger, $A$ or $B$, where

$$A = \dfrac{1}{2015} (1 + \dfrac12 + \dfrac13 + \cdots + \dfrac{1}{2015})$$
and
$$B = \dfrac{1}{2016} (1 + \dfrac12 + \dfrac13 + \cdots + \dfrac{1}{2016}) \text{  ?}$$
Prove your answer is correct.
To determine which number is larger, \( A \) or \( B \), we need to compare the two expressions:

\[ A = \dfrac{1}{2015} \left(1 + \dfrac{1}{2} + \dfrac{1}{3} + \cdots + \dfrac{1}{2015}\right) \]
\[ B = \dfrac{1}{2016} \left(1 + \dfrac{1}{2} + \dfrac{1}{3} + \cdots + \dfrac{1}{2016}\right) \]

1. **Define the Harmonic Sum:**
   Let \( H_n \) denote the \( n \)-th harmonic number, which is defined as:
   \[ H_n = 1 + \dfrac{1}{2} + \dfrac{1}{3} + \cdots + \dfrac{1}{n} \]

2. **Express \( A \) and \( B \) in terms of Harmonic Numbers:**
   \[ A = \dfrac{1}{2015} H_{2015} \]
   \[ B = \dfrac{1}{2016} H_{2016} \]

3. **Approximate the Harmonic Numbers:**
   The harmonic number \( H_n \) can be approximated using the natural logarithm:
   \[ H_n \approx \ln(n) + \gamma \]
   where \( \gamma \) is the Euler-Mascheroni constant (approximately 0.577).

4. **Apply the Approximation:**
   \[ H_{2015} \approx \ln(2015) + \gamma \]
   \[ H_{2016} \approx \ln(2016) + \gamma \]

5. **Substitute the Approximations:**
   \[ A \approx \dfrac{1}{2015} (\ln(2015) + \gamma) \]
   \[ B \approx \dfrac{1}{2016} (\ln(2016) + \gamma) \]

6. **Compare the Two Expressions:**
   Since \( \gamma \) is a constant, we focus on the logarithmic terms:
   \[ \dfrac{1}{2015} \ln(2015) \quad \text{and} \quad \dfrac{1}{2016} \ln(2016) \]

7. **Analyze the Logarithmic Terms:**
   Note that \( \ln(2016) \) is slightly larger than \( \ln(2015) \), but the difference is very small. However, the denominators 2015 and 2016 are very close to each other. To compare these terms more precisely, we can use the fact that for large \( n \), \( \ln(n+1) \approx \ln(n) + \dfrac{1}{n} \).

   Therefore:
   \[ \ln(2016) \approx \ln(2015) + \dfrac{1}{2015} \]

8. **Substitute and Simplify:**
   \[ B \approx \dfrac{1}{2016} (\ln(2015) + \dfrac{1}{2015} + \gamma) \]
   \[ B \approx \dfrac{1}{2016} \ln(2015) + \dfrac{1}{2016 \cdot 2015} + \dfrac{\gamma}{2016} \]

   Since \( \dfrac{1}{2016 \cdot 2015} \) is a very small positive number, it slightly increases the value of \( B \).

9. **Conclusion:**
   Given the very small difference between \( \ln(2015) \) and \( \ln(2016) \), and the fact that \( \dfrac{1}{2016} \) is slightly smaller than \( \dfrac{1}{2015} \), the term \( \dfrac{1}{2016 \cdot 2015} \) makes \( B \) slightly larger than \( A \).

The final answer is \( \boxed{ B } \) is larger than \( A \).