"at first, the group of investors were not impressed by young calvin's for the new advertising campaign, but by the end of the presentation, everyone was on board with the plan." a) conceivable b) conceive c) conceiving d) concept

D)concept

Explanation:

"At first, the group of investors were not impressed by young Calvin's concept for the new advertising campaign, but by the end of the presentation, everyone was on board with the plan."

In the above sentence, the only reasonable word for the blank space is concept. The other options can't make any suitable sentence in accordance with the rest of the sentence structure. They all represent either a verb or an adjective whereas the word 'concept' is a noun.