Differentiate between ‘can’ and ‘could’ in terms of expressing possibility.

A. The main difference is that ‘can’ is used for general possibility or ability in the present or future, while ‘could’ is used for more tentative or polite possibility in the past or present.

B. Can is used for past possibilities while could is used for future possibilities.

C. Can and could are interchangeable and have the same meaning when expressing possibility.

D. Could is used for general possibility in the present or future, while can is used for more tentative or polite possibility.