The sticky end is an expression which is used for DNA strands that are cut by enzymes at the exact points that they complement each other through their bases. Cytosine corresponds the Guanine and Thymine corresponds to Adenine. When the DNA is cut at the correct spots, these corresponding matches stick together. So the answer to the question is given by the option A, single-stranded complementary tails because they are open ended with the bases mentioned before and can form bonds with their corresponding base.
The type of molecules that contains the alcohol glycerol are PHOSPHO-LIPIDS. Glycerol is a three carbon alcohol on which some phospholipids are built. Phospholipids which are derived from glycerol are called phosphoglycerides.
