How are visual aids used most effectively in a speech

C. To support a speaker's point by providing evidence or clarity.

Explanation:

Visual aids, such as photographs, videos, diagrams, graphs, charts, etc. have the ability to enhance a speech by providing evidence or clarifying a specific point or showing data in a way that is easily comprehendable and/or comparable (i.e. a line graph comparing two sets of data, or a pie chart showing the composition of the data).

they fear for their lives

each morning i wrote my name

on the dusty cabinet, then crossed

the dining table in script, scrawled

in capitals on the backs of chairs,

practicing signatures like scales

while mother followed squirting

linseed from a burping can