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The error is in part C of the sentence. Replace the past tense form of the verb CHRONICLED with its base form, CHRONICLE, as the base form of a verb is used with DID. Thus, B is the right answer.
P, Q, R and S can do a piece of work in 20 days. If P and Q together can do it in 50 days, and R alone in 60 days, then in how many days can S alone do it?
Efficiency of A, and B are in the ratio of 3 : 4. If both can do a work together in 30 days. Find out how much days A will take to complete the work alone?