One sweet shop owner thinks to start customizing the sweets with respect to the need of customers. In this way, they can get more customers. But by doing this, their production capacity will reduce because they have to customize sweets and because of different customers have different demand, so they can't sell all of their sweets in a day which they used to sell earlier.

What can be inferred from the above situation?

A) Sweet shop can't make more profit by customizing sweets.

B) Their market demand will increase by doing this.

C) All of their sweets will sell out in one day.

We take a look at the given statements as follows:

A) Sweet shop can't make more profit by customizing sweets. → As they are customizing sweets, so there will always be a decent possibility of a certain portion of sweets being wasted. This wastage will lead to a net loss. Hence, we can infer this from the given passage.

B) Their market demand will increase by doing this. → If this would have been the case, then there would have been no doubts in the minds of the sweet shop owner. Due to the demand, the shop would have always stayed in profit. Hence, this cannot be inferred from the passage. 

C) All of their sweets will sell out in one day. → There is no guarantee that this would happen as their sweets would have been customized and all customers might not want customized sweets. Some might want regular sweets as well. Hence, this cannot be inferred from the passage. 

Therefore, only statement A can be inferred from the given passage. 

Hence, only statement A can be inferred.