The correct answer is D) noun.
For example: We took these apples so that we can eat them.
'Them' is an object pronoun, and it is used to refer to the noun 'apples', you use a pronoun so as not to repeat the noun several times.
I believe it is our creativity and imagination that allows us to see the possibilities in the future on how to develop something perhaps quite small into something bigger and better first perhaps by getting our toe in the door as in say getting a small contract and then gradually opening the door to more opportunities.
