For the given idiom, four sentences are provided below. Identify the sentence that demonstrates the correct contextual usage of the idiom. If no sentence is grammatically and contextually correct, select "None of these" as the correct alternative.

Bite the bullet

The correct answer is: "Although she was terrified of dental procedures, she knew she had to bite the bullet and schedule the appointment."

Explanation and Contextual Usage:

The idiom "bite the bullet" means to force oneself to undergo a difficult, painful, or unpleasant situation with courage and fortitude, especially one that has been delayed or avoided.

Let's analyze the given options to find the correct contextual usage:

1. "Due to the unexpected storm, our profits from agricultural exports have decided to bite the bullet."
This is incorrect because profits cannot make conscious decisions or face unpleasant situations with courage.

2. "The children were playing music so loudly that their grandfather decided to bite the bullet in frustration."
This is incorrect as "biting the bullet" implies enduring an unavoidable difficult task or confronting a challenge, not simply reacting in anger or frustration to noise.

3. "The suspect decided to bite the bullet every time the detectives questioned him about the crime."
This is incorrect because the context implies staying silent or resisting interrogation, which does not fit the meaning of facing a necessary unpleasant task.

4. "Although she was terrified of dental procedures, she knew she had to bite the bullet and schedule the appointment."
This is correct because scheduling a dental appointment despite being terrified of it perfectly matches the meaning of accepting and facing a difficult or unpleasant task courageously.