Which type of lipid is classified into triglycerides and waxes?

Which of the following molecules releases the highest amount of energy?

Match Column-$I$ with Column-$II$ and select the correct answer:

Column-$I$	Column-$II$
$(A)$ Triglyceride	$(i)$ Animal hormone
$(B)$ Structural lipid	$(ii)$ Feathers and leaves
$(C)$ Steroid	$(iii)$ Phospholipid
$(D)$ Wax	$(iv)$ Fat storage in droplet form

Following are the statements with reference to 'lipids'.
$(a)$ Lipids having only single bonds are called unsaturated fatty acids.
$(b)$ Lecithin is a phospholipid.
$(c)$ Trihydroxy propane is glycerol.
$(d)$ Palmitic acid has $20$ carbon atoms including carboxyl carbon.
$(e)$ Arachidonic acid has $16$ carbon atoms.
Choose the correct answer from the options given below.

How many carbons does arachidonic acid have?

Which organic substance has a high energy value?