Hi!
The correct option would be Low Density Lipoproteins.
LDL is what is known as 'the bad cholestrol' because of the very reason that it increases the risk of heart disease. LDL tends to accumulate in the walls of the arteries and causes narrowing of the blood vessels. This increases the chance of blockage and the formation of a blood clot that may eventuate in a heart attack or stroke.
Hope this helps!