A
barium salts are white in colour and this helps the stomach to appear clearly in contrast with other regions in the picture
B
barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
C
barium is a good absorber of y-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
D
barium allows X-rays to pass through the stomach on account of its transparency to X-rays