Best time to exercise is morning time
Gases can be produced by normal flora (bacteria that normally lives in the intestines) and harmful bacteria as well.
Acute coronary syndrome is a group of symptoms caused by myocardial ischemia.
The answer is source B because it has a listed author who is an expert and it is the governments organization website which are more reliable that a .com website. Source A does not even list the author so you do not know who wrote it could be anyone.
