Speaker/ can/ add/ enormous/ to/ complexity/ of / the /verbal message/ through/ simple/ non-verbal/ signals.

• A. 
  Speaker can add enormously to the complexity of the verbal message through simple non-verbal signals.
• B. 
  A speaker can add enormously to the complexity of the verbal message through simple non-verbal signals.
• C. 
  Speaker can add enormous to the complexity of the verbal message through simple non-verbal signals.
• D. 
  A speaker can add enormous to complexity of the verbal message through simple non-verbal signals.