The answer to this question would be: knee chest position.
The position that ideal for sigmoidoscopy would be knee chest position as the position giving a good height and maneuverability to the operator. But the position might be not very comfortable for the patient. Another position that can be used is left lateral position.
It’s B why do I have to write 20 characters
Explanation:
mass is a weight ofan object .
A (m) is likely to be smallest