Statement:
"Enjoy your challenges" - an advertisement of a car brand.
Assumptions:
I. People wish to enjoy challenges.
II. There are people who are willing to buy a car.
Answer: D
As the advertisement reads - enjoy challenges. It is as if an advise is given.
So, I is not implicit.
According to the statement people found these people to be good, but not the author by himself. Hence, II is not implicit. So, II is not implicit.
Neither I nor II is implicit.