Find out whether there is any grammatical error in below sentence. He tried as he could / Naveen did not / succeed in getting / his car to start up.

Answer: Option A

The phrase He tried as he could is grammatically incorrect.

The correct form should be He tried as hard as he could or He tried his best.

Option B Naveen did not, Option C succeed in getting, and Option D his car to start up are all grammatically correct.

Conclusion: The error is in Option A and should be corrected to He tried as hard as he could.