An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because:

1. It gains water due to osmosis.
2. It loses water due to reverse osmosis.
3. It gains water due to reverse osmosis.
4. It loses water due to osmosis.

HINT: It is an example of osmosis.
Explanation :
When an unripe mango is placed in a concentrated salt solution to prepare pickle then mango loose water due to osmosis
and get shrivel.