Write an Equivalent Expression $a+(b+3)$ A) $a+(3+b)$ B) $a(b+3)$ C) $(a+b)+3$ D) $(b+3)+a$

Write an equivalent expression. Use an associative law.
- $a+(b+3)$

A) $a+(3+b)$
B) $a(b+3)$
C) $(a+b) +3$
D) $(b+3) +a$