Fill in the Blank with One of the Words or Phrases

Multiple Choice

Fill in the blank with one of the words or phrases listed below. $$\begin{array} { l l l } \text { contradiction } & \text { linear inequality in one variable compound inequalitysolution } \\\text { absolute value } & \text { consecutive integers union } \\\text { formula } & \text { linear equation in one variable intersection }\end{array}$$
-An equation in one variable that has every number (for which the equation is defined) as a solution is called a(n) _____

A) solution
B) contradiction
C) identity
D) compound inequality