Joinder of charges is permissible under

Joinder of charges refers to the combining of two or more charges against an accused in a single trial. It is allowed to avoid multiplicity of trials and to ensure a more efficient judicial process.

In the context of the Code of Criminal Procedure (CrPC), the provision that deals with joinder of charges is:
B. Section 220 of Criminal Procedure Code
C. Section 221 of Criminal Procedure Code

Both of these sections govern the joinder of charges in a criminal trial, allowing the court to try multiple charges against an accused in a single trial if certain conditions are met.

Option A is incorrect:
Section 200 of the Criminal Procedure Code does not deal with joinder of charges. It pertains to the examination of the complainant by a Magistrate to take cognizance of an offence.

Therefore, the correct answer is:
D. Both B and C