Choose the sentence which is grammatically correct among all.

Concept

Adjectives describe nouns (for example, an unpleasant, nasal tone), while adverbs describe verbs, adjectives, or other adverbs (for example, spoke coldly). When two descriptive words jointly modify the same noun, both must be adjectives, and when two verbs or manners in a sentence are linked by 'and'/'but', they must be grammatically parallel to each other -- for instance, two matching adverbs, not an adverb paired with a full clause.

Application

Here, 'tone' is a noun, so the words placed before it must be adjectives, and the two ways the teacher conveyed the information must both be adverbs. The grammatically correct sentence uses the adjectives 'unpleasant' and 'nasal' before the noun 'tone', keeps both verbs in the past tense ('had', 'conveyed'), and pairs the adverb 'clearly' with the parallel adverb 'humorously'. ('Unpleasant' means not pleasing, and a 'nasal tone' is a voice that sounds as if it is coming through the nose, as when someone has a blocked nose.)

Why the other options fall short

• "The drawing teacher spoke in a thick tone, coldly, but conveying the information clearly and was funny." breaks parallel structure -- it coordinates the participial phrase 'conveying the information clearly' with the finite clause 'was funny' instead of a matching adverb, and shifts from the past-tense verb 'spoke' to the participle 'conveying' partway through.

• "The drawing teacher had coldly, thick tone, but conveyed the information clearly and humorously." places the adverb 'coldly' directly before the noun 'tone', where an adjective is grammatically required, and also drops the article before 'thick tone'.

• "The drawing teacher spoke coldly, nasal tone, but conveyed the information clearly and humorously." leaves 'nasal tone' with no verb or preposition connecting it to the rest of the sentence, producing a fragment rather than a complete, grammatical sentence.