In each of the questions given below, read each sentence to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Mark the part with the error as your answer. If there is no error, mark ‘No error’ as your answer (Ignore the errors of punctuation, if any).
A. She decided to study every evening for 
B. two hours so that she could prepare well 
C. for her exams and improve her chances of 
D. getting good grades through all subjects.