The Table Below Contains the Length of Time (Minutes) for Which

Multiple Choice

The table below contains the length of time (minutes) for which different groups of students were able to stay awake to revise statistics after consuming 500 ml of one of three different types of stimulants. What is the variation in scores from groups A to B to C known as?
$\begin{array} { | c | c | c | } \hline A & B & C \\\hline 20 & 15 & 40 \\\hline 15 & 12 & 33 \\\hline 120 & 7 & 50 \\\hline 57 & 18 & 135 \\\hline\end{array}$

A) The within-groups variance
B) Homogeneity of variance
C) The grand variance
D) The between-groups variance