How Was the Approach Taken by Mendel Similar to the Approaches

Multiple Choice

How was the approach taken by Mendel similar to the approaches taken by modern scientific inquiry?

A) Mendel repeated his rexperiments
B) Mendel only manipulated a single variable.
C) Mendel used the same technical methods are are used today.
D) Mendel's experiments challenged several hypotheses that were favored at the time.