Question

the topic sentence below is...
thesis
online textbooks are more practical than paper textbooks.
topic sentence
audiobooks provide a safe way for drivers to stay entertained.
strong weak: not a claim weak: off topic
weak: redundant

Explanation:

The thesis is about comparing online and paper textbooks. The topic sentence is about audiobooks for drivers, which is unrelated to the thesis's topic (textbook types). So it's off - topic.

Answer:

Weak: Off Topic