Answer:
A). tending the sick is mutually rewarding.
Explanation:
The syntax or the grammatical structure employed in the line 'This....Endears' primarily function to highlight the speaker's viewpoint that 'being inclined towards the sick or unwell people is mutually rewarding.' This is because on the one hand, it helps the patient overcome his sickness through the concern and moral support while on the other hand, it makes the person who is looking after feel contented, being a god's son and have positive emotion for being compassionate, gentle, and kind to other humans. Thus, option A is the correct answer.