Answer:
I'd say the answer is choice C.
Explanation:
Given the provided information I'm assuming the narrator find Mangan's sister as a goal or an idol of sorts who they see hope wisdom and in this case, light. Light can be used as Mangan's sister's symbolism of great, or ideal.
When the narrator see's the sister he/she/they is reminded of light and goodness.
Hope this helps! ^^
Because it can help them bond and have fun together but i dont think it matters the race i think in general its good for a family . Hope i helped