Three Research Subjects in a Project About Long-Term Memory Were

Three research subjects in a project about long-term memory were asked to memorize a series of words. Subject 1 was asked if the word was in capital letters. Subject 2 was asked if the word rhymed with another word given. Subject 3 was asked if the word made sense in a specific sentence presented. Who was likely to remember the most words and why?

A) Subject 1 because his task was least distracting.
B) Subject 2 because his task used sound.
C) Subject 3 because his task required deeper processing.
D) Subject 3 because his task required only superficial processing.