​The demand for Dell laptops is more price elastic than the demand for laptops as a whole.This can be best explained by the fact that

A) ​There are fewer substitutes for Dell laptops than for laptops as whole
B) There are more substitutes for Dell laptops than for laptops as whole
C) Dell laptops are luxurious goods
D) ​Dell laptops are a necessity

The price that the buyer of a call option pays for the underlying asset if she executes her option is called the

A) strike price.
B) exercise price.
C) execution price.
D) strike price or execution price.
E) strike price or exercise price.