The following sentences that is grammatically correct is:
- B. The exercise program was effective, exciting and challenging.
A sentence is made up of a group of words that have a predicate, a verb, a subject and makes sense.
For a sentence to be grammatically correct, it has to obey the rules of concord which says the verb must agree with the subject in number.
As a result of this, the sentence from the given answer choices that is correct is option B. This is because it not only obeys the rules of concord, but it has a parallel structure.
Therefore, the correct answer is option B
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