Explanation:

- Statement (A): It measures the wholesale prices on a weekly basis.

- Incorrect. The WPI is typically measured on a monthly basis, not weekly.

- Statement (B): It focuses on both goods as well as services.

- Incorrect. The WPI primarily focuses on goods and not on services.

- Statement (C): It measures the wholesale prices on a monthly basis.

- Correct. The WPI is calculated monthly.

- Statement (D): It focuses only on goods, not on services.

- Correct. WPI deals mainly with the price of goods.

- Option 1: C and D only

- Correct. Both these statements about the WPI are accurate.

- Option 2: D only

- Incorrect. C is also a correct statement.

- Option 3: A, B, and D only

- Incorrect. A and B are not correct.

- Option 4: C only

- Incorrect. D is also a correct statement.

- Option 5: A and C only

- Incorrect. A is not correct.