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.
The answer would be “but” since it contrasts his motivation with competing with others for a high score.
Hopefully this helped.
Answer:
neglected by another
AND
to fall into decay
Explanation:
Thriftless implies when a person is spending money in a way regarded as wasteful or extravagant. From the passage, thriftless as used signifies a heir who spends money built by his father recklessly, hence the words from the text that helps to indicate the meaning of the word as used in the passage will be "neglected by another" and "to fall into decay". These shows thriftless and a nonchalant attitude towards money being spent or already spent.
