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.

**Which of the following must be true of the sales representative's schedule ?**

** Option:**

**A.**She visits M before Q.

**B.**She visits N before R.

**C.**She visits P before M.

**D.**She visits P before S.

**E.**She visits Q before R.

**Answer: A . She visits M before Q.**

** Justification:**

Clearly, she visits M before N and N before Q. So, she must visit M before Q.