The correct option is (D) some very boring people.
To find the correct option:
Therefore, the correct option is (D) some very boring people.
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The correct question is given below;
The following sentences test correctness and effectiveness of expression.
Curiosity about other people, about the ways they think and act, has caused Jeff to meet some fascinating characters as well as people which also really bore him.
(A) people which also really bore him
(B) he encountered really boring people
(C) very boring people are also met
(D) some very boring people
(E) very boring people also