If a convertible bond is issued with a $ 1000 face value, a 4% coupon and it converts in to 50 shares of the common stock of the issuer, this bond is an attractive purchase at face value when:

A. Market Interest rates are at 4.25% and the shares are trading at $28/share

B. Market interest rates are at 5% and the shares are trading at $20/share

C. Market interest rates are at 4.00% and the shares are trading at $ 20/share.

D. Market interest rates are at 3.5% and the shares are trading at $22/share.