David Is Having Trouble Breathing, Feels Out of Breath When

Multiple Choice

David is having trouble breathing, feels out of breath when he rides his bike, and has a hard time catching his breath when he walks any distance. His doctor will most likely check for and recommend a test for ______.

A) respiratory system changes and recommend a physical exercise plan and diet
B) cardiovascular functioning and recommend a physical exercise plan and diet
C) immune system declines and recommend stress reduction
D) both immune and respiratory system declines and recommend medication