select the most appropriate word to fill in the blank. You have travelled a long way. You ____ be tired. (a) should (b) could (c) must (d) can

Options

A. should
B. could
C. must
D. can

Explanation

Must- We use MUST when we want to say that it is necessary or very important that something happens in the present or future
In the given sentence, the first part is you have travelled a long way, so the latter part should be- “you must be tired”.