Question

Visual aids can be very useful to a speaker because they do not require a great deal of explanation. often take the place of statistics. enhance the clarity of a speaker's ideas. can be passed among members of the audience. all of these answers are correct.

Answer 1

Not all of them are correct but one which is "enhance the clarity of a speaker's ideas".

Visual aid is an instructional gadget, for example, a graph, guide, or model that interests essentially to vision; particularly an instructive movie or filmstrip etc. but they still need explanation from the speaker but help his speech in creating clarity for the audience.