The question below can be answered using the sentence given in only one of the options. Find out the option which can be used to answer the question. Seven persons R, S, T, U, V, W and X joined a organisation on different dates. Who is the first person to join the organisation?

From Option 'A', W joined before X but after R. Only three persons joined after X. S joined before X. We get: Case 1: S > R > W > X > __ > __ > __ Case 2: R > S > W > X > __ > __ > __ Case 3 R > W > S > X > __ > __ > __ So, from option 'A', we get either S or R is the first person to join the organisation. From Option 'B', at least two persons joined before and after S. T joined just before V and just after X. U joined after W and R. V joined before U. We get: Case 1: R/W > W/R > S > X > T > V > U Case 2: W/R > X > T > V > S > R/W > U Case 3: X > T > V > S > W/R > R/W > U Case 4: X > T > V > W/R > S > R/W > U So, from option 'B', we get W, R or X is the first person to join the organisation. From Option 'C', W joined before X but after R. S joined after W but before X. T joined before V but after X. U joined before W. We get: Case 1: U > R > W > S > X > T > V Case 2: R > U > W > S > X > T > V So, from option 'C', we get either U or R is the first person to join the organisation. From Option 'D', only two persons joined after T. X joined before T but after S. R joined just before W. Both S and U joined after W. We get: R > W > S > X > T > U/V > V/U So, from option 'D', we get R is the first person to join the organisation. Therefore, data given in option 'D' is sufficient to answer the question.