Question

petroleum is a useful fossil fuel and a convenient source of energy for vehicles. it is also easy to transport. what is a disadvantage of petroleum? it can be transported in a variety of ways. spills that occur have negative effects.

Explanation:

The first option "It can be transported in a variety of ways" is a positive aspect (advantage) as the original text already mentions it's easy to transport. The second option "Spills that occur have negative effects" points out a harmful consequence (disadvantage) related to petroleum.

Answer:

Spills that occur have negative effects.