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.