How does "time" affect a presentation?

Question $21$ options:

a$)$

An audience may experience a speech very differently at one time of day versus another.

b$)$

Audiences can become unable to listen as well after a certain number of minutes.

c$)$

The organization or person who asks you to speak may have expectations about time limits$.$

d$)$

A$-$C are all true.

e$)$

A$-$C are all false.