Help me please Explain possible circumstances under which an adult child may
have undue influence in a relationship with an elderly parent.

i think seeing their grand parent arguing with a parent, probably would make them question a lot, and they might evem stay away from them for a while, though, i may have took your question wrong, very sorry

Explanation:

if your meaning a situation where the child either wants to get away from them or they feel apart from them, this might help.

answer; i believe its (d) intrinsic;

muslims control the north africa during the period of 1500 up

to 1800. they made a barrier to prevent further european exploration from

entering the africa from the north. however, the dutch ware still able to move

toward the interior with having south africa as one of the routes leading to

the east for trading with asia.