Which of the following situations would require an increase in the coupon rate for a bond selling at par?A-The addition of a call provisionB-The addition of a convertibility optionC-The increase in...

Which of the following situations would require an increase in the coupon rate for a bond selling at par? A-The addition of a call provision B-The addition of a convertibility option C-The increase in the rating from BBB to AA D-The addition of sinking fund provision