To constitute an offence of criminal conspiracy, what is the necessary condition to be proved?

• A. There must be a prior meeting of two or more persons.
• B. There must be an agreement of two or more persons to do an illegal act or to do a legal act by illegal means.
• C. A person does an illegal act with the help of two or more persons.
• D. Two or more persons commit a crime on a sudden provocation with guilty mind.