The Smiths ________ sending e-mails ________ letters, because it is faster.

A. prefer; to writing

B. prefer; to write

C. prefers; to writing

D. preferes; to write

The Smiths _____ _  sending e-mails _____  letters, because it is faster. sending

A. prefer, to writing                     B. prefer, to write

C. prefers, to write                      D. prefers, to writing