They are clinically proven to protect individuals from atherosclerosis
(C) is the false statement. Omega-3 fatty acids are NOT proven to protect against atherosclerosis. The outcome studies are lacking and the evidence is not yet convincing.
(A) is true. that is one of the hallmarks of these drugs. The lowering effect is on par with fibrates and niacin (30-40%). There are no changes to a slight increase in BOTH HDL and LDL.
(B) is true. The fishy taste after taking a fish oil tablet is what is meant here.
(D) is surprisingly true. These drugs interact with anticoagulants and may potentially lead to an increased bleeding time.