Of all the special occasion speeches described in the chapter, for which type of speech is it most important to pay attention to language choices and evoking the emotions of an audience?

A commemorative speech

Explanation:

Commemorative speech is a type of speech that is typically given at special/important occasion or event to celebrate an individual, event, a group, an idea etc or probably given to bring(recall) into memories something or someone . In commemorative speech it is appropriate for a speaker to evoke the emotional needs of it audience. Eulogy given at a funeral is an example of  commemorative speech

A commemorative speech is also known as tribute or a ceremonial speech

depends on what they need

answer; the changing age structure of the population;