Suppose an agricultural labourer earns Rs. 400 per day in her village. She gets a job to work as babysitter in a nearby town @ Rs. 700 per day. She chose to work as agricultural labourer. Which one of the following is the opportunity cost of the agricultural labourer?

• A. Rs. 1,100
• B. Rs. 700
• C. Rs. 400
• D. Rs. 300