The primary market deals with the issuance of new securities, which is regulated under the Securities Act of 1933. This act requires issuers to provide full disclosure of material information to investors to ensure transparency and fairness in new offerings.

A is correct because the Securities Act of 1933 governs initial offerings.

B is incorrect because the Securities Exchange Act of 1934 regulates secondary market trading.

C is incorrect because the Investment Advisers Act of 1940 pertains to investment advisers.

D is incorrect because the Investment Company Act of 1940 governs mutual funds and other investment companies.