Please help 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