Data Sufficiency

Directions: The question below is followed by three statements I, II and III. Read all the statements carefully and find out which of the given statements is/are sufficient to answer the question. Choose the correct alternative.

In a certain code, ‘PYC’ means “we are friends”. Which letter stands for ‘we’?
Statements:
I. ‘XYZ’ means “they are classmates”.
II. ‘CMS’ means “we love them”.
III. ‘PR’ means “Hello friends”.