The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
"It is a cheap reasonably / restaurant in this part of the town / where you can eat / delicious food."

The error lies in the segment "It is a cheap reasonably". The word "reasonably" is an adverb that modifies the adjective "cheap". According to standard grammar rules, a modifier should precede the word it modifies. Therefore, "cheap reasonably" should be inverted to "reasonably cheap".
* Incorrect: It is a cheap reasonably restaurant...
* Correct: It is a reasonably cheap restaurant...