If due to traffic density we are travelling below the minimum speed on a motorway, how should we do it?

If due to traffic density we are travelling below the minimum speed on a motorway, how should we do it?
A)We will travel on the shoulder.
B)We will travel on the shoulder until the next exit.
C)We will travel on the carriageway.Correct
Any driver who, for emergency reasons, is forced to drive their vehicle on a motorway or dual carriageway at an abnormally reduced speed, seriously disturbing traffic, must travel along the right shoulder and exit at the first available exit.
This is not the case in the question; we are travelling below the minimum speed due to traffic density, not due to an emergency, so we will continue to drive on the carriageway.