Final answer:
The statement contains a grammatical error; 'sweeter' is a double comparative. The correct form is 'sweeter' without the word 'more'.
Step-by-step explanation:
The statement in the question is false. Rhubarb is a tart vegetable, so a rhubarb pie is typically not very sweet. The sweetness of a pie depends on the amount of sugar added to the filling. While the restaurant's rhubarb pie may have more sugar than a homemade version, it is not accurate to say that it is sweeter because the sweetness can be subjective and depends on personal taste preferences.
Moreover, the use of sweeter in the question is grammatically incorrect. The correct comparative form of 'sweet' is 'sweeter,' without the additional 'more.'
The given statement, "The rhubarb pie from the restaurant is sweeter than the homemade one," is grammatically incorrect. The correct comparative form of 'sweet' is 'sweeter' without the use of 'more,' as 'sweeter' itself is a comparative adjective.
To use 'more' would be appropriate for adjectives that do not have a comparative form ending in '-er.' Therefore, the proper way to convey the intended meaning would be to say, "The rhubarb pie from the restaurant is sweeter than the homemade one." The use of 'sweeter' is a common mistake known as a double comparative, which should be avoided in standard English.