A.I. Explanation:

Option 1: "You have been offered a job."

Explanation: This statement is a factual detail mentioned in the text but does not capture the main idea. The main idea focuses on the negotiation process rather than simply stating that a job offer has been made.

Option 2: "The time has come to negotiate your salary."

Explanation: While this statement is true and reflects a part of the text, it does not encompass the overall message. The main idea is about proving your worth in the negotiation process, which is broader than just the timing of the negotiation.

Option 3: "To get the best salary, you need to prove your worth."

Explanation: This option accurately reflects the main idea of the text. It emphasizes the necessity of demonstrating one's value to achieve the best salary, which aligns with the text's focus on negotiation and self-worth.

Option 4: "The question to ask yourself is, “How much am I worth?”"

Explanation: Although this statement is a key question posed in the text, it does not summarize the main idea. The main idea is about the broader concept of proving worth in salary negotiations, rather than just asking a question.