Select the most appropriate option to substitute the bracketed segment in the given sentence. If there is no need to substitute it, select 'no substitution required'.

The only course of action to (fend of the loud clamour off conspiracy theories) everyone fully informed.

A

fend off the loud clamour of conspiracy theories

B

No substitution required

C

fend off the loud clamour off conspiracy theories

D

fend of the loud clamour of conspiracy theories