I'm just horrible on this math and i don't get it at all.

which is a simplified form of the expression 3(m + 1) + 2m?
a. m + 3
b. 5m + 1
c. 3m + 1
d. 5m + 3

which is a simplified form of the expression -2b – 3(2b + 1)?
a. -b + 1
b. -5b + 1
c. -8b – 3
d. -8b – 1

which is a simplified form of the expression -4(3r – 2) – 2(r + 1)?
a. 4r – 1
b. 10r – 7
c. -14r + 6
d. -12r – 1

which is a simplified form of the expression 5c – 7(2c – 4)?
a. 9c + 28
b. -9c + 28
c. 9c - 28
d. -9c – 28

which is a simplified form of the expression 3a + 7 – a – 7?
a. 2a
b. 4a
c. 2a + 14
d. 4a – 14