Which of the Following Results in Increased Scatter Radiation Reaching

Multiple Choice

Which of the following results in increased scatter radiation reaching the IR?
1) Imaging a thicker body part
2) Using a lower kVp
3) Decreasing collimation

A) imaging a thicker body part and using a lower kVp only
B) imaging a thicker body part and decreasing collimation only
C) using a lower kVp and decreasing collimation only
D) imaging a thicker body part, using a lower kVp, and decreasing collimation