Multiply Using One of the Rules for the Square of a Binomial

Multiple Choice

Multiply using one of the rules for the square of a binomial. Assume any variable exponents represent whole numbers.
- $( 7 x - y ) ^ { 2 }$

A) $49 x ^ { 2 } + y ^ { 2 }$
B) $49 x ^ { 2 } - 14 x y - 2 y ^ { 2 }$
C) $49 x ^ { 2 } - 7 x y + y ^ { 2 }$
D) $49 x ^ { 2 } - 14 x y + y ^ { 2 }$