Bite the hand that feeds you means to harm or criticize someone who helps or supports you. The correct answer is this meaning because the expression is used figuratively, not only by its literal words.

Examples:

• Insulting your sponsor is like biting the hand that feeds you.
• In an HSC essay, Bite the hand that feeds you can express this meaning: to harm or criticize someone who helps or supports you.
• When this expression appears in a passage, connect Bite the hand that feeds you with the idea of to harm or criticize someone who helps or supports you.