Which statement is true?

A .The expression (x + 1) + (2x + 2) is equivalent to 3x + 1.
B. The expression (x +3) + 3(x + 2) is equivalent to 2x + 3.
C. The expression 2(4 + x) + 3x + 8 is equivalent to 4x + 16.
D. The expression (15 + 2x) + (x + 3) is equivalent to 3x + 18.