Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Write a mathematical expression for the quantity described verbally.
-The area of a triangle whose altitude is 8 more than its base length $x$

A) $\frac { 1 } { 2 } ( x ) ( x - 8 )$
B) $( x ) ( x + 8 )$
C) $\frac { 1 } { 2 } ( x ) ( x + 8 )$
D) $\frac { 1 } { 2 } x ^ { 2 } - 8$