What is the most appropriate meaning of the idiom "Go the extra mile"?

Correct option is B

The correct answer is (b) Going above and beyond whatever is required for the task at hand. The idiom "Go the extra mile" means to put in more effort than what is expected or required to achieve a goal. This expression is often used in professional, academic, and personal contexts where individuals demonstrate exceptional commitment, dedication, or diligence. For example, a teacher staying after hours to help a student or a customer service representative resolving an issue beyond standard protocol are considered as “going the extra mile.” The phrase emphasizes voluntary effort, driven by integrity, empathy, or a strong sense of responsibility.
The origin of this idiom is biblical, from the Sermon on the Mount, where it was stated, "If anyone forces you to go one mile, go with them two miles." This teaching advocated generosity and selflessness. In modern usage, the phrase is a strong compliment for those showing exceptional perseverance or work ethic.