no chatgpt, will upvote for right answer. Just show calculations, no written explanation please.

Cryogenics Inc. has $100$ million shares trading at $ $5$ a share. The firm has $ $300$ million in debt, $ $150$ million in cash and marketable securities and $ $100$ million in equity options outstanding.

What value is the market attaching to the operating assets of the firm?

A$.$ $ $750$ million

B$.$ $ $650$ million

C$.$ $ $600$ million

D$.$ $ $450$ million