A sales representative plans to visit each of six companies M, N, P, Q, R and S exactly once during the course of one day. She is setting up her schedule for the day according to the following conditions :**(i).** She must visit M before N and R.**(ii).** She must visit N before Q.**(iii).** The third company she visits must be P.

**If the sales representative visits S first, which company must she visit second ?**

** Option:**

**A.**M

**B.**N

**C.**P

**D.**Q

**E.**R

**Answer: A . M**

** Justification:**

Of the six companies if S is first, P is third and the orders M N Q and M R are followed. Clearly, M must be visited second.