Answer:
d) vanquish
Step-by-step explanation:
The word "vanquish" is the one that most strongly conveys a boastful tone. This word means "to conquer" or "to defeat," especially when doing so due to superior force. This word can create a boastful tone due to the fact that it implies a strong power or superior capacity. This is a connotation, or an implied meaning that is additional to the denotation (dictionary meaning) of the word.