John and Karla Have Been Dating for a Couple Weeks

John and Karla have been dating for a couple weeks. They have been on two dates, and seem to have communicated much more through text messaging. Karla has become frustrated with John because more often than not her longer messages are met with a reply of "OK," "k," or "Kk." Which of the following BEST accounts for Karla's frustration with John?

A) John's use of paralanguage cues.
B) John's lack of fluency in electronically mediated communication.
C) John's not maintaining a barrier between private and public life.
D) John's not using paralanguage cues.