Read the following instructions on how to use the parking machine, then answer the question. "1. CHECK TIME SHOWN ON MACHINE DISPLAY, 2. INSERT COINS TO GIVE THE REQUIRED EXPIRY TIME (Coins accepted: 5P, 10P, 20P, 50P, £1, £2), NO CHANGE GIVEN; 3. PRESS FOR TICKET, Display inside vehicle window; TURN HANDLE TO CANCEL (if necessary). A 50P coin is___ by the machine. a. reserved b. accepted c. refunded d. rejected

The correct answer is b. accepted. The parking machine clearly indicates that it accepts various coins, including the 50P coin, to cover the parking fee until the specified expiry time. If you're ever in doubt about using a parking machine, remember that reading the instructions carefully can save you from mistakes. Always check that the coins you’re inserting are compatible with the machine and keep an eye on the display for any specific messages or prompts.