Multiply Using the Rule for Finding the Product of the Sum

Multiple Choice

Multiply using the rule for finding the product of the sum and difference of two terms.
- $$( 7 + r ) ( 7 - r )$$

A) $49 - 14 r - r ^ { 2 }$
B) $14 - r ^ { 2 }$
C) $49 + 14 r - r ^ { 2 }$
D) $49 - r ^ { 2 }$