Explanation:

1, 2, 3 and 4

The Protection of Civil Rights Act, 1955, is aimed at preventing and punishing offences related to the practice of untouchability. The Act declares certain acts as offences, and these include:

Preventing any person from entering any place of public worship: This act is considered an offence under the Protection of Civil Rights Act.

Denying access to any shop, hotel, or places of public entertainment: Such denials are considered offences under the Act.

Insulting a person belonging to a scheduled caste on the ground of untouchability: Acts of insult or humiliation based on untouchability are offenses under the Act.

Refusing to sell goods or render services to any person: Refusing to sell goods or provide services to a person based on untouchability is considered an offence.

Therefore, the correct answer is Option 4: 1, 2, 3, and 4.