Choose the correct alternative to replace the highlighted phrase in the sentence if it is grammatically incorrect. If the sentence is free of errors, mark the option indicating no correction is needed.

Healthcare is among the sectors severely effected by COVID-19.

The correct option to replace the highlighted phrase is sectors severely affected.

Grammar Rule & Analysis:
1. Affect vs. Effect:
- Affect is usually a verb meaning "to influence or produce a change in something."
- Effect is usually a noun meaning "the result or consequence of a change."
In the given sentence, a past participle verb is required to modify the noun "sectors" (describing how COVID-19 impacted or influenced them). Therefore, the verb form affected must be used instead of "effected".

2. Plural Noun ("among the..."):
The phrase "among the..." refers to one out of a group of multiple items, which requires a plural noun following it. Thus, "sectors" is correct, whereas "sector" (singular) is incorrect.

3. Adverb Usage:
"Severely" is an adverb modifying the participle adjective/verb "affected", indicating the degree of impact. Therefore, "severely affected" is grammatically correct.

Putting it all together, the correct phrase is "sectors severely affected".