Ily thank u sm for this <3
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.
Answer:
very old is the adjective
The use of the comma here is incorrect because t<span>hese are two independent clauses and should be separated by a semi-colon or a period not a comma. Hope this is what you are looking for. </span>
