Select the sentence that has a grammatical error.

Correct option is B

The grammatical error in option (b) is the missing article before the noun "eraser".
· "Eraser" is a singular countable noun, and such nouns must be preceded by an article ("a" or "an") or another determiner.
· The correct sentence should be: "I wish I had an eraser to erase all the mistakes in my life."
When using singular countable nouns, always include an article or determiner before the noun unless another modifier is present.
· Correct: I bought an umbrella.
· Incorrect: I bought umbrella.