Consider the Following Data from a 40-Item Math Skills Test $\begin{array}{ll}\text { Age Group } & \text { Mean Score } \\3rd & 32.1 \\4th & 37.5 \\4 \text { th } & 39.3\end{array}$

Multiple Choice

Consider the following data from a 40-item math skills test administered to three groups of elementary school students. $\begin{array}{ll}\text { Age Group } & \text { Mean Score } \\3rd & 32.1 \\4th & 37.5 \\4 \text { th } & 39.3\end{array}$
Interpretation of these data for 5th graders may be limited by the test's

A) baseline effect.
B) discrimination effect.
C) ceiling effect.
D) floor effect.