17 CFR § 33.9 - Unlawful activities.
It shall be unlawful for any person:
(a) Required to be registered with the Commission in accordance with the Act or these regulations expressly or impliedly to represent that the Commission, by declaring effective the registration of such person or otherwise, has directly or indirectly approved such person, or any commodity option transaction solicited or accepted by such person;
(b) In or in connection with an offer to enter into, the entry into, the confirmation of the execution of, or the maintenance of any commodity option transaction, expressly or impliedly to represent that compliance with the provisions of the Act or these regulations constitutes a guarantee of the fulfillment of the commodity option transaction;
(c) Upon acceptance of an order for a commodity option transaction, to fail unreasonably to secure prompt execution of such order or upon rejection of an order to fail to notify the person whose order has been rejected of such rejection;
(d) To manipulate or attempt to manipulate the market price of any commodity option on or subject to the rules of any contract market: Provided, however, That for purposes of this paragraph (d), any action taken by a contract market pursuant to a rule approved by the Commission or any emergency action which a contract market is permitted to take pursuant to the Act or these regulations shall not be deemed to be a manipulation; and