Lucius Works at a Factory

Lucius works at a factory. After work, when all his colleagues have gone home, Lucius goes down to the basement of the factory where he has set up a methylamphetamine lab. Ronnie is a night security guard at the factory. Every night, Ronnie unlocks the basement for Lucius and keeps the fire doors open at Lucius' request. Ronnie knows what Lucius is up to but decides to turn a blind eye. Which ONE of the following statements is true in respect of Ronnie's liability?

A) Ronnie cannot be guilty of an offence under the Misuse of Drugs Act 1971 as he does not make the drugs himself. Merely opening doors for Lucius is not sufficient for liability.
B) Ronnie could only be convicted of being an occupier or concerned in the management of the premises which he knowingly permits or suffers to be used for the production of a Class A drug, contrary to s.8, Misuse of Drugs Act 1971.
C) Ronnie could be convicted of producing or being concerned in the production of a Class B drug, contrary to s.4(2) , Misuse of Drugs Act 1971 as he is not the one making the drug.
D) Ronnie could be convicted of being concerned in the production of a Class A drug, contrary to s.4(2) , Misuse of Drugs Act 1971 and/or being an occupier or concerned in the management of the premises which he knowingly permits or suffers to be used for the production of a Class A drug, contrary to s.8, Misuse of Drugs Act 1971.