I am afraid I cannot relate the details now.

Answer: Option B

Instruct : tell or order someone to do something, especially in a formal or official way.
Recount : tell someone about something; give an account of an event or experience.
Recollect : remember (something); call to mind.
Tell : communicate information to someone in spoken or written words.
Relate : give an account of; narrate.

Synonym of Relate is Recount