Solution:
"Can" is a modal verb used in the English language. It denotes the ability to do something. It can also be used to ask permission. For example, "You can take the pen" is giving permission to take the pen. The base form of the verb is used with "can", like, e.g., can (take, ride, read, play, sing, hear, mould, and so on).In the given options, only option A and option B uses the base form of the verb. Option C and option D can be eliminated as it uses the present continuous and past form, respectively. In option B, "to" is used after "can". Hence, it is wrong. So, option A is the right answer.
