Despite the financial crisis, the company decided to tighten its belt and invest in a risky new project.

The idiom "tighten its belt" means to cut expenses and be frugal, which contradicts the idea of investing in a risky project. "Throw caution to the wind" means to act recklessly or take a bold risk, which fits the sentence best.Meanings of other idioms:Go out on a limb – Take a risk or support an idea that others may not.Play it safe – Avoid risks and be cautious.Keep its head above water – Struggle to survive financially or emotionally.Since the company is making a bold investment despite financial difficulties, option (c) is the best choice.