The components of internal debt among the given options are:

I. Market borrowing

II. Treasury bills

III. Special securities issued to RBI

Therefore, the correct answer is:

I, II, and III

All three options, namely market borrowing, treasury bills, and special securities issued to RBI, are components of internal debt. Internal debt refers to the debt incurred by the government from domestic sources within the country. Market borrowing involves the government raising funds by issuing bonds or securities in the open market. Treasury bills are short-term debt instruments issued by the government to meet its short-term financial obligations. Special securities issued to RBI refers to government securities issued specifically to the Reserve Bank of India (RBI) as a part of the government`s borrowing program.

Hence, all three options mentioned are components of internal debt.