Question

a scientist researching methods to convert used motor oil into gasoline would most likely be investigating which process? joining molecules into longer chains breaking molecules into smaller chains changing straight chains into rings changing rings into straight chains

Explanation:

Used motor - oil has larger hydrocarbon molecules compared to gasoline. To convert used motor - oil into gasoline, the larger molecules need to be broken down into smaller chains as gasoline consists of smaller hydrocarbon chains.

Answer:

B. breaking molecules into smaller chains