Correct Answer: D
Explanation:
To find the coefficient on the x term, first define what the coefficient of an expression represents.
In a general example,
axn
a represents the coefficient of the x term and n represents the degree or order of the expression.
For the particular expression in this question,
y2 + 3x
the x term is 3x.
Therefore the a value or coefficient is,
3x → a = 3