Simplify the Expression by Combining Any Like Terms $4 b - 7 b$

Multiple Choice

Simplify the expression by combining any like terms.
- $4 b - 7 b$

A) $- 3 b$
B) $3 b$
C) $- 11 \mathrm {~b}$
D) $- 3 b ^ { 2 }$