Theory a Explains Phenomenon L and Phenomenon M Using Principles

Multiple Choice

Theory A explains phenomenon L and phenomenon M using principles X and Y.Theory B explains phenomenon L and phenomenon M using principle X.Theory C explains phenomenon L using principles X and Y.Which of the following statements is true?

A) Theory A is the most parsimonious.
B) Theory B is the most parsimonious.
C) Theory C is the most parsimonious.
D) Theory A and Theory C are equally and most parsimonious.
E) Theory A and Theory B are equally and most parsimonious.