Unjustified enrichment refers to the fact that the benefit is obtained for non-erroneful reasons and that others suffer losses.
According to the above definition, which of the following options does not constitute a relationship of unjustified enrichment for A and B?
On 5 July, A and B entered into a contract for the purchase of rice. July 10 A in accordance with the contract to pay a loan of 20,000 yuan. On 15 July B refused to pay for the rice. On 1 August, the contract was unilaterally terminated