The subject of your writing refers to the

it can be many reasons such as they could want they're family to live and explore more two. might just want to be nice.

3.some say for the greater good or future.

4. they might want to have they're baby,kid,family explore more. people just sacrifice.

true fact:

someone is sacrificed everyday.

the correct answer is:   [c]:

                    →     " leave it out. "  

hope this is to you!

        best wishes!