Correct Answer - Option 3 : 75

**Given:**

Total people travelling by the train = 1200

Calculation:

A group of 1 captain and 15 soldiers = 16 people

Total number of groups of 16 people = 1200/16 = 75

Now, each group comprises of 1 captain,

So, number of captains in 75 groups = 75

**∴ Total number of captions = 75**