Explanation:

- Marriage by intrusion is a custom where a person forcefully intrudes into another community to take a bride, often without prior consent.

- This practice involves a kind of abduction, which contrasts with traditional arranged marriages.

- Option 1: Birhor tribe

- The Birhor tribe is a primitive tribal group found in India.

- Traditionally, they have practiced marriage by intrusion.

- Option 2: Ho tribe

- The Ho tribe is an ethnic group primarily inhabiting the states of Jharkhand, Odisha, and West Bengal.

- They have also been documented practicing marriage by intrusion.

- Option 3: None

- This implies that neither of the tribes practices marriage by intrusion, which is incorrect in this context.

- Option 4: Both

- Both the Birhor and Ho tribes are noted for this practice.

Correct Answer: Option 4- Both