Answer:
16
D is correct.
Explanation:
Coefficient: The coefficient is a number front of variable.
![Expression: x^2+16y](https://img.qammunity.org/2019/formulas/mathematics/high-school/4uvc3e6bxvq00xufwsuzzdoa0luzno8bmh.png)
In the given expression there are two terms
x² and 16y
First term: x²
The coefficient of x² is 1
Second term: 16y
The coefficient of 16y is 16
Hence, The coefficient of 16 of the given expression.