Provided the reverse manoeuvre does not exceed 15 metres or invade an intersection, you may drive in reverse...

A)on motorways and expressways that run through built-up areas.
B)as a complementary manoeuvre to stopping.Correct
C)when it is not possible to change direction or course.
As a general rule, driving in reverse is prohibited, except in the following cases:

1. As a complementary manoeuvre to stopping, parking or merging into traffic. In this case the reverse distance may not exceed 15 metres or invade an intersection.
2. When it is not possible to move forward or change direction or course. In this case there is no limit on the reverse distance, and even an intersection may be invaded if necessary.

The reverse manoeuvre is prohibited on motorways and expressways.