1. Why ______
A. do people laugh at one joke but not another depends
on many factors.
B. people laugh at one joke but not another depends on
many factors.
C. people laugh at one joke but not another depends on
many factors?
D. do people laugh at one joke but not another depends
on many factors.
ANSWER is B
This is a nouns clause. It is not a question!
it = why people laugh at one joke but not another
It depends on many factors.
If it is a question then:
Why does it depend on many factors that people laugh at one joke but not another?
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