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.
A complete verb includes the main verb and all of the helping verbs. The helping verb in this sentence is "has," and the main verb is "mailed." "Not" is never considered a verb. Therefore, the complete verb is "has mailed"
When none of the characters are true, but the setting may be true, and what happens in the story actually happened in real life (at least some- most of it)
hope this helps
Thes best option from the given answers, would letter A.