Error spotting (exam direction): Identify the erroneous part (A/B/C) — choose D if there is no error — 'If you work hard, / you will get good grades / in examinations. / No error'

Given parts (A–D)
A. If you work hard,B. you will get good gradesC. in examinations.D. No error

Concept/Approach (article with specific context)
In formal exam English, when referring to a known/regular set of tests, use the definite article: 'in the examinations.' Without the article, the phrase is considered incomplete in this set-phrase context.

Step-by-step correction
1) Add article: 'in examinations' → 'in the examinations'.2) Full: 'If you work hard, you will get good grades in the examinations.'

Verification
Compare set phrases: 'in the test/in the exam' for specific institutional assessments.

Final Answer
C — write 'in the examinations.'