Explanation:

- Section 34 deals with the concept of joint liability in criminal law. When a criminal act is done by several people with a common intention, each person is liable as if they had done it alone.

- Option 1: Two persons - This is the correct choice. At least two people are needed to form a common intention.

- Option 2: More than two persons - Incorrect, because just two people can fulfill the requirement.

- Option 3: Five persons - Incorrect, five people aren't specifically required.

- Option 4: None of the above - Incorrect, as option 1 is correct.