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.
Your answer is A. I hope I help and I hope you get a good grade!!
Well I would say do an event that is most signifigant to you. It could be a Tragic or Happy memory, or one that is simply close to your heart.
What does the idiom, "it's raining cats and dogs" mean?
We can collaborate on the project together.
These artifacts are from the Neolithic Era.
Teacher, may I please use the lavatory?
If the structure isn't built right, the ceiling could collapse!
What is the isotherm on the map?
The medicine will help alleviate the pain.
It might mean the destruction of a planet or of natural ecosystems.
