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. $$\begin{array} { l l l l l } \text { set } & \text { inequality symbols } & \text { opposites } & \text { absolute value } & \text { numerator } \\\text { denominator } & \text { grouping symbols } & \text { exponent } & \text { base } & \text { reciprocals } \\\text { variable } & \text { equation } & \text { solution } & &\end{array}$$
-A is a collection of objects

A) base
B) solution
C) variable
D) set