In examination of lumbar sine AP we fined that sacroiliac joints are not equidistant from the film, the cause was

In examination of lumbar sine AP we fined that sacroiliac joints are not equidistant from the film, the cause was:
A- High KV technique was used
B- Bucky not used
C- Patient was not in true AP position
D- Tube was not angled correctly
E- Exposure made in full inspiration