'Keep your fingers crossed' is an idiom expressing hope or wishing for good luck in a situation, often used before exams or important events.

'Between a rock and a hard place' means facing a dilemma where both choices are equally unfavorable.

'Not cut out for the job' means lacking the necessary abilities or qualities for a position.

'Going the extra mile' metaphorically means doing more than expected or required in work or service.

'Bite the bullet' means to accept a difficult or painful situation with courage and determination.

'Throw in the towel' means to give up or surrender. The context implies they didn't give up despite challenges.

'Bite the bullet' means to face a difficult or painful situation courageously. The context supports this meaning as the entrepreneur is facing financial challenges.

'Keep your fingers crossed' is an idiom meaning to hope for good luck. Option B correctly uses it in a context where hoping for a favorable outcome (interview success) is appropriate.

'The ball is in your court' is an idiom meaning it is now your turn to act or make a decision. The responsibility lies with you.

'Go the extra mile' is an idiom meaning to make additional effort or do more than expected. It does not literally mean traveling distance.