D. parallel structure just means that all of your verbs in the comma series line up in regards to tenses, here. in choice D, it's "BE friendly," "INTRODUCE yourself," and "SMILE." these are all present tense verbs.
the rest of the choices don't match--"exercise" and "stretching" are two different verb forms in choice A, "to go to the library" is the odd one out in choice B, ane "to build" doesn't match with the "-ing" verbs in choice C.
When
editing your essay for verb tense, it is important to check action word used if
its past, present and future.
Perfect
tenses serves a portraying the verb or the action word as something that
already happened or is completed, thus the term ‘perfect’. If it is present
perfect tense, it means that the action was already done relatively to the
present (has/have with past participle). If it is past perfect tense, action is
already finished relatively to the past (had with past participle and if it is
future perfect tense, action is complete relatively to the future (will have
with past participle).
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Answer:
Humans have to sleep and robots don’t
Explanation:
The person who wrote this is Robert Frost
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