Which type of presentation addresses "why" questions?

4.2.13. It is always appropriate to demonstrate polite listening

a. True b. False

The following comprises a well-crafted point in a speech about the lingering effects of the Exxon Valdez oil spill in Prince William Sound, Alaska, on April 5, 1989: "The persistence of the oil will threaten the sound's ecosystem for decades to come."

Indicate whether the statement is true or false.