A. at least once every six months.

B. At least once a year.

C. at least twice a year.

D. at least twice a year.

One,

Consumer rights and interests refer to the rights and interests that consumers enjoy in accordance with the law when they receive goods or services with compensation and in a certain period of time.

Consumer's rights and interests are the rights granted to the end users of goods to meet the objective needs of economic operation under certain social and economic relations.

1962 March 15 former us president John F. Kennedy delivered a special presidential speech on protecting consumers' interests in the us congress, in which the famous "four rights" of consumers were put forward for the first time, namely:

The right to safety; Have the right to obtain correct information; Have the right to choose freely; Have the right to put forward consumer opinions. 3 15 indicates that these four rights put forward by Kennedy are gradually recognized by consumer organizations all over the world and regarded as the most basic work goals.

From 1983, every March 15, consumer organizations all over the world will hold large-scale activities to publicize consumer rights.

In the modern market economy, according to the needs of social and economic operation and the dominant position of consumers in the market, the state has formulated clear legislation, which makes the rights and interests of consumers not only become the norms agreed and recognized by the public, but also be confirmed and protected by national laws.

Consumers can complain to the consumer association where the consumer is located, or to the consumer association where the responsible person is located. After receiving the complaint, the consumer association will transfer the consumer's complaint to the complained unit and ask it to handle and answer the question within the specified time.