If We Apply Conversion, Obversion, and Contraposition to a Categorical

Multiple Choice

If we apply conversion, obversion, and contraposition to a categorical proposition, how many of the resulting propositions will be equivalent to the original?

A) 1
B) 2
C) 3
D) 2 for universal propositions, 3 for particular ones
E) 2 for affirmative propositions, 3 for negative ones