Life has its share of problems; one should take them on the face rather than shying away from them.
Take it on the chin means to face adversity without complaint.
take them on the heart
The correct phrase is take them on the chin, which means to endure something, especially difficulties, without complaining. - Option (A) take them on hand is not a standard phrase. - Option (B) take them on the head is not idiomatic. - Option (D) take them on the heart is also incorrect. Thus, the correct choice is take them on the chin (Option C).
The sentence calls for an idiom meaning to face difficulties with resilience rather than avoiding them, so checking which body-part phrase is the recognised idiom for enduring hardship, as opposed to an invented variant, resolves the question.
Only option C is the genuine idiom for enduring difficulties resiliently.
Hence, the correct answer is Option C.