Which contextual factor involves knowing how large or small the space in which you are speaking will be and whether a microphone will be available?

Answer: Environmental Contextual Factor

Explanation:

This factor takes into consideration the physical factors in the place where a communication is to take place. This is important because communication is a two way activity and the environment in which it takes place has some effect on the free flow of communication.

If the space is small, there would be no need for a microphone as the speaker can effectively communicate. But, if it is a large space with a large crowd, then a microphone would be invaluable. The location, space as in the above question, and even the degree of hotness or coldness of the communication location are examples of some other environmental contextual factors.