Question

Identify the choice that is a run-on sentence.

Rubber, which is inexpensive and durable, is used to make car tires.
O Aluminum is a lightweight metal steel is a very heavy metal.
Cars used to be made mostly of metal parts, but now plastic makes up about half of the construction of new cars.
Steve collects antique cars; he especially likes to restore classic muscle cars.

Answer 1

B- Aluminum is a lightweight metal steel is a very heavy metal.

Step-by-step explanation:

These are two different sentences. To be grammatically correct, they need to be separated somehow, like with a semi-colon or a period. Or you could insert a word, like 'Aluminum is a lightweight metal, while steel is a very heavy metal.'