Choose the most appropriate adverb to complete the sentence:- Althoug…

The correct answer is Option (4) → highly

An adverb is a word that tells how, when, where or how much something happens. It can also describe an adjective or another adverb, for example she sings sweetly, very hot.

Complete sentence: Although she had initial doubts about the success of the project, it eventually turned out to be highly successful. Although joins two ideas that contrast: the second part states something unexpected after the first.

Option	What it tells	Example
(1) barely	only just, almost not. "Barely successful" would agree with her doubts and leave no contrast for "Although".	He barely caught the last bus.
(2) merely	only, nothing more than. It makes the success sound small, which does not answer the "Although" clause.	It was merely a scratch, not a wound.
(3) hardly	almost not. "Hardly successful" means the project nearly failed, which matches her doubts instead of contrasting with them.	I could hardly hear him in the noise.
(4) highly (answer)	This sentence: first part: she had doubts about the success of the project. second part: the project eventually did well, so the adverb must show a high degree of success. Highly means to a great degree, very. "Highly successful" completes the contrast.	The new film was highly praised by critics.