The help desk is expected to manage customer service
The answer is parallelism.
The subject of the sentence is her sketches. Also at the beginning of the list it says their unusual perspective so you have to continue using plural pronouns.
The sentence should read: Her sketches are unusual because of their unusual perspective, radical use of color, and their unexpected subjects.
Answer:
b. The flower bloomed earlier than expected.
Explanation:
The other three have 'was' before the verbs; 'the athlete <em>was</em> penalized', 'the child <em>was</em> fed', 'he <em>was</em> convinced', etc. This puts these three sentences in the passive voice. While, 'the flower <em>bloomed</em> earlier than expected' shows the flower acting the verb, rather than the verb acting on it, thus making putting it in the active voice.
hope this helps !!