Read the excerpt from "a simple way to create suspense".

for instance, heading toward a movie review program, i remember we asked: who was the studio’s first choice for the harry callahan role in "dirty harry”?

we knew most viewers would be intrigued. (what, clint eastwood wasn’t the first choice? ) but—and this was the lesson—the success of the tactic didn’t depend on intrigue. even viewers with no interest at all stuck around to find out. humans are hard-wired. they need to know. even viewers who knew the answer for sure stuck around, in order to be gratified. the gap was bridged, and the danger averted. (it was frank sinatra. you waited, right? )

which best describes this excerpt?
a. the central idea of this excerpt is that clint eastwood was not the original choice for the dirty harry movie.
b. the central idea of this excerpt is that intrigue is the most important way to create suspense.
c. the author uses an analogy to compare his readers to the characters of a hollywood movie.
d. the author uses a personal anecdote to show that audiences are willing to wait for an answer.