Answer:
B. Writing
Step-by-step explanation:
Non verbal communication is defined as the transfer or messages through a no verbal platform such as posture, personal space and various other types of body language signals.
People usually use verbal incorrectly as a synonym with oral. That is why "writing" is sometimes mistaken for a nonverbal form of communication. Writing lacks non verbal components that are a natural part of spoken laguage, like intonation amongst others. Hence the answer.