Which of the following sentences is grammatically correct?

Question

Quizplus · Accepted Answer

The assistant waited patient while his boss answered some calls.
Patient is an adjective and in this sentence, it's modifying the verb "moved", which is incorrect. Adjectives can't modify verbs, adverbs do. In this case, "patient" should be substituted by "patiently."
The assistant did waited patiently while his boss answered some calls.
The auxiliary verbs do, does, and did can be followed by the bare infinitive in affirmative sentences to express emphasis. In this sentence, "did" is followed by the past perfect "waited", which is not correct, and should be substituted by the infinitive "wait."
The assistant did wait patiently while his boss answered some calls.
The auxiliary verbs do, does, and did can be followed by the bare infinitive in affirmative sentences to express emphasis, which is not needed in the context of this sentence.

Which of the Following Sentences Is Grammatically Correct