Select the most appropriate phrase to substitute the highlighted segment.
The scientist’s research was pivotal in advancing our understanding of genetic mutations.

Correct option is A

The correct substitution of the highlighted words is (a) essential in furthering.
Explanation: “Pivotal in advancing” means extremely important or crucial in making progress. The phrase “essential in furthering” conveys the same meaning.
Grammatical rule used:
· Use "essential in + -ing form" to show something is crucial for development.
· Example: Her role was essential in establishing the new policy.
�� Information Booster: "Furthering" means pushing forward progress or development, especially in academic or research contexts.