Within how many days from the date of registration the first auditor of the company should be appointed?

The correct answer is C. 30.

The Companies Act, 2013 requires a company to appoint an auditor within 30 days of its incorporation. The auditor is responsible for auditing the company’s financial statements and reporting to the shareholders on the company’s financial position.

Option A is incorrect because it is too short a period of time to appoint an auditor. Option B is incorrect because it is too long a period of time to appoint an auditor. Option D is incorrect because it is not a valid option.