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.

• A
  $(a)$ and $(b)$ only
• B
  $(c)$ and $(d)$ only
• C
  $(b)$ and $(c)$ only
• D
  $(b)$ and $(e)$ only