Both James and Thomas Have Theories That Explain Why Listening

Both James and Thomas have theories that explain why listening to classical music while reading is associated with increased recall of the material. James' theory is much simpler than Thomas'. Thomas created his theory a few months before James did. Which of the following is true?

A) James' theory would be considered better because it is more parsimonious.
B) James' theory would be considered better because it was thought of more recently.
C) Thomas' theory would be considered better because he thought of it first.
D) Thomas' theory would be considered better because it is more complex.