Presumption is best defined as:

• A. The act of assuming
• B. A belief without proof
• C. The act of believing something with proof
• D. A guess based on evidence

Answer: (A)

Presumption is about treating something as true without having proof. That makes the act of assuming the best fit: you decide or take for granted something as true even though you haven’t established evidence to prove it. The idea is the action of assuming, not merely holding a belief or conviction.

A belief without proof describes the belief itself, which is close but focuses on what you think rather than the act of deciding to think it. A guess based on evidence isn’t right because presumption involves lack of proof, not reliance on proof. Believing something with proof is the opposite of presumption.