In the Reaction Between CO and Fe₃O₄, the Theoretical Yield

In the reaction between CO and Fe₃O₄, the theoretical yield in an experiment is calculated to be 47.2 g Fe. When a careless chemistry student carries out the experiment, the actual yield is 37.0 g Fe. Calculate the percentage yield.

A) 78.4%
B) 21.6%
C) 52.3%
D) 39.2%
E) none of these