Final answer:
The correct answer is 'a. All of these are confidential information' since it includes the number of current residents, the seller's reasons for selling, and information about any deaths on the property, all of which are considered sensitive personal details or legally protected information in real estate transactions.
Step-by-step explanation:
When considering which of the following is confidential information regarding real estate transactions, 'a. All of these are confidential information' is the correct answer. This includes how many people currently live on the property, the reason the seller wishes to sell the property, and any deaths that have occurred on the property.
Usually, the number of residents is considered personal information, the seller's motivation can contain sensitive details affecting their privacy, and knowledge about any deaths might be protected by local laws or seen as sensitive, even stigmatizing information that could affect the property's value.