Answer: D. Allows viewing access to strangers.
Step-by-step explanation:
Open houses are done to advertise houses and involve allowing just about anybody to see a house on sale. This provides an excellent opportunity for buyers to meet sellers. It has advantages such as generating leads for new listings as well as identifying buyers for other properties.
A very important disadvantage however, is that it allows access of the house to strangers. These strangers might not be interested at that moment but instead have ulterior motives for wanting the house.