Can u guys help I keep forgetting this

Which factor is likely to impact the possible number of compounds ?

What two factors can affect the properties of a hydrocarbon? a. the number of its carbon atoms and the number of single bonds b. the number of its carbon atoms and the arrangement of its atoms c. the arrangement of its atoms and the number of its double bonds

Analyze the reaction to determine whether the reaction is exothermic or endothermic. explain your reasoning.