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B is corrent because the public sale of all securities must be registered unless the securities or the transaction qualify as exempt.
A is incorrect because many things besides shares of stock in a corporation qualify as securities. An example is the sale of limited partnership interests, which obviously are not issued by a corporation.
C is incorrect because the cost of registration to the issuer has no bearing on whether registration is or is not required.
D is incorrect because registration under the 1933 Act is to provide investors with full and fair disclosure of all material information relating to the issuance of securities and prevent fraud and misrepresentation. The SEC does not evaluate the financial risk a purchaser is undertaking when purchasing the approved security.