combine responsibilities

Many women long to be mothers, but don’t know if they could …… responsibilities with work.
a) admire
b) reduce
c) prefer
d) combine [color=green](Answer Key)

Source: school exam

Is the phrase “combine responsibilities” natural you? It sounds odd to me. What does it mean exactly?

Thank you.

It means do the two - being a mother and working at the same time… I think that ‘combine’ works all right. Perhaps you can point up the meaning by saying - combine those responsibilities with work.