Correct Answer: A
Explanation:
The example sentence features a verb tense error. Since "described" is in the past tense and the writing Babar did about Qadeer contains descriptions of Qadeer, the verb "writing" should agree with the tense of "described." Replacing the underlined section with "and wrote that" is the correct answer.
While "asserts" and "says" are both potentially correct verbs to insert, those options were in the present tense, and thus would be incorrect in this context.
The phrase "and has written" would need to be a separate clause, and would require a comma preceding it to be correct.