The question below can be answered using the sentence

Solution

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.