The talk test is a simple way to measure relative intensity. In general, if you're doing moderate-intensity activity you can talk, but not sing, during the activity. If you're doing vigorous-intensity activity, you will not be able to say more than a few words without pausing for a breath.
The correct answer is B. because it's true that Capillaries are connected between the arteries and veins and that Pulmonary arteries transport blood low in oxygen from the right ventricle to the lungs. But veins carry blood towards your heart so B isn't true
This question is incomplete and I cannot answer it correctly for you without more information
