Choose the most suitable option to replace the highlighted part of the sentence:
The doctor advised him to stop consuming junk food and doing workouts regularly.

The correct option is: to stop consuming junk food and to work out regularly.

Step-by-step Explanation:

1. Parallel Structure (Parallelism): In English grammar, when connecting two actions or clauses with a conjunction like "and", the connected elements must share the same grammatical form. In the original sentence, the doctor advised him to do two things:

First action: "to stop consuming junk food"
Second action: "doing workouts regularly"

2. Identifying the Error: The verb "advised" takes an infinitive verb pattern (advise someone to do something). The first part uses the infinitive form ("to stop..."), while the second part incorrectly uses the gerund form ("doing..."). This creates a fault in parallel structure.

3. Correcting the Sentence: To maintain parallelism, both actions should be in the infinitive structure:

"...advised him to stop consuming junk food and to work out regularly."

Additionally, using the phrasal verb "to work out" is more natural and grammatically precise than "to do workouts" in this context.

Therefore, replacing the highlighted part with "to stop consuming junk food and to work out regularly" makes the sentence grammatically correct and balanced.