The question asks to choose the incorrect sentence. Here’s the analysis of the options:

A. The Japanese eat a lot of fish; however, they eat a lot of tofu.

This sentence is correct. The semicolon and "however" are used properly.


B. The Japanese eat a lot of fish as tofu.

This sentence is incorrect. "As tofu" is grammatically and logically wrong since it implies fish is equivalent to tofu.


C. The Japanese eat a lot of fish, and they also eat a lot of tofu.

This sentence is correct. It uses proper conjunctions and structure.


D. The Japanese eat a lot of fish. Besides, they also eat a lot of tofu.

This sentence is correct. "Besides" is used appropriately to add additional information.


Answer: B is the incorrect sentence.