On retirement/death of a partner, the remaining partners who have gained due to the change in profit sharing ratio should compensate the:

Remaining Partners (who have sacrificed) as well as retiring partners

The correct answer is option 2- Remaining Partners (who have sacrificed) as well as retiring partners.

On retirement/death of a partner, the remaining partners who have gained due to the change in profit sharing ratio should compensate the remaining Partners (who have sacrificed) as well as retiring partners. 

It is possible that when a decision is made to change the profit-sharing ratio among the remaining partners, a continuing partner may also agree to reduce a portion of their share in future profits. In such a scenario, the continuing partner's capital account will be credited, just like the retiring or deceased partner's capital account, in proportion to the sacrifice made. Conversely, the capital accounts of the other continuing partners will be debited based on their increased share in the future profit ratio.