Topic: Preposition,

Best Answer Explained in Below-:

The phrase "My father forgot his umbrella ___ home" requires a preposition that accurately conveys the relationship between the umbrella and the location of home. The most suitable choice here is "at," making the complete sentence read: "My father forgot his umbrella at home."

The preposition "at" is used to indicate a specific point or location, implying that the umbrella was left at the precise place we know as home. In this context, it clearly suggests that the umbrella was not taken along when he departed.

On the other hand, "on," "in," and "to" do not fit well in this scenario. "On home" sounds awkward and incorrect because "on" implies a surface, which is not applicable here. "In home" implies the umbrella is inside the house, which doesn’t capture the intended meaning of forgetting it altogether. Lastly, "to home" suggests a direction towards home rather than a static location where something was left.

Thus, using "at" effectively communicates that the umbrella is located at home, emphasizing the absence of the item in his current location.