Final answer:
The correct word to complete the sentence is 'usurers,' as it refers to individuals who lend money at high interest rates, which relates to the context of the person struggling for money.
Step-by-step explanation:
The word that best completes the sentence is usurers. A usurer is someone who lends money at unreasonably high rates of interest, which can be a desperate measure for someone struggling financially. In the sentence given, the context suggests that the individual was in need of money and chose a less than honorable or desirable way to obtain it. The other options, caste and gallantries, do not fit the context, as caste refers to a social class system and gallantries refer to polite attention or respect given by men to women, none of which are related to the act of borrowing money. Hence, 'usurers' is the correct word to complete the sentence, implying the individual resorted to borrowing money at high interest rates.