The tricuspid valve is the valve that is located between the right atrium and the right ventricle but it does not direct blood to the lungs, it stops blood from flowing back into the right atrium. The pulmonary valve does in a way push the blood to the lungs, but it is located between the right ventricle and the pulmonary artery, not the right atrium and right ventricle.
The answer is A. However, since I do not want to accidentally plagiarize, I will give you a link to a wonderful in-depth explanation from another Brainly user who answered the exact same question.
brainly.com/question/7102361
The answer would be Uracil.
