Explanation:

Let’s break it down:

- Among Indian tribes, widow remarriage called ‘Sagai’ is actually found in the Ho tribe.

- Ho (Option 1): For the Ho, ‘Sagai’ means marrying a widow, and it’s a recognized social practice. They’re primarily in Jharkhand, Odisha, and nearby regions.

- Toda (Option 2): The Toda, from the Nilgiris, follow unique marriage customs but don’t call widow remarriage ‘Sagai’.

- Kharia (Option 3): Kharia are another tribal group in Jharkhand and Odisha, but they don’t use the term ‘Sagai’ for widow marriage.

- Khasi (Option 4): The Khasi from Meghalaya practice matriliny, but widow marriage is not referred to as ‘Sagai’ here, either.

- The correct answer is:

Option 1: Ho

So, the practice of widow marriage known as ‘Sagai’ is specific to the Ho tribe. That’s the main point.