Given:
The expression is given as 15x + 3.
The objective is to find the equivalent expression.
Expression:
The general distributive property is,
[tex](ab+a)=a(b+1)[/tex]Using the distributive property, the given expression can be written as,
[tex]15x+3=3(5x+1)[/tex]Thus, the expression is obtained as 3(5x + 1).
Hence, option (C) is the correct answer.