Answer:
A
Explanation:
Saturated means all the carbon atoms has four single bonds around it. These bonds are strong and won't break easily therefore saturated hydrocarbons aren't very reactive
Unsaturated means in one instance the C has a double bond with another carbon. This double bond can be easily broken therefore making unsaturated compounds more reactive than saturated compounds
So saturation deals with the type of bonds the carbon has with other carbon atoms. (The C-C bonds)
