"in the past" makes the most sense here :)
Answer:
'The mercenaries fought for as long as they were paid, not just the 40 days a year that knights fought.'
Explanation:
This supports the statement that hired soldiers would fight for longer than knights would. They had motivation which was currency in exchange for their participation in battle/war. The knights on the other hand were only required a certain amount of days. It was not stated whether they were paid or not, but I can assume that they were not which would make one--specifically--a knight reluctant to go to battle. Therefore, hired soldiers did the work the knights were reluctant to do.
Can you put a clearer pic?
Because a beach is not a person, the only pronoun that can be used is "it."
Should be:
Implied meaning (C)