Which sentence contains correct information about the object of a preposition?

a. in the sentence "pinetop got its name from a local saloon owner," "local" is the object of the preposition.
b. in the sentence "the city was founded in the late 19th century," "founded" is the object of the preposition.

c. in the sentence "lakeside got its name from the beautiful lakes that surround the city," "lakes" is the object of the preposition.

d. in the sentence "mormon pioneers settled in the area," "the" is the object of the preposition.