I agree please help with your inputs

First of all , I am still dubious when I see the students fixating with the meaning of a word and do not grasp the real essence of the sentence

here we are talking about that many more men will stay longer as employees than before because they want to stay mentally healthy and have mental fitness.

I mean: one of the most important skills is to make the argument as you were in the same situation.

How may time we read on a newspaper that the key as we age is to read a lot, work because our mind is like every other body's muscle: you need to train it and to perform a workout to stay mentally fit

Aside the fact that piquant means stimulation to the sense not stimulating to the mind. Like pleasantly spicy.

Also why we use a word that means basically stimulating when we do have the next noun which is stimulation ??

H is completely out

I is the answer

I chose ( worldly) because of (intangible benefits)
am I wrong because retired people want to feel they are still important for world

worldly\ephemeral would be compatible with tangible concrete things not intangible mental ones.