The difference between liquid triglycerides and solid triglycerides is in
a.
the number of nitrogen groups
b.
the number of carbon-carbon double bonds
c.
the number of hydrocarbon groups
d.
the number of carbon atoms

B.  

the number of carbon-carbon double bonds

Explanation:

Triglyceride is the ester which is derived from the glycerol and three units of fatty acids.

There are two types of triglycerides which are saturated and unsaturated triglycerides.  

Saturated fats are the triglycerides in which there is not double bond between the carbon atoms. These have higher value of melting point and are solid at the room temperature.  

Unsaturated fats are the triglycerides which have some double bonded carbon atoms. These have lower value of melting point and are liquid at room temperature.