<span>A) They suggest that reality exists outside the mind, whether or not a person can perceive it</span>
The answer i think would be subject
I believe the direct object is the swimming hole and the indirect object is the ranch. In school, I learned that you should be able to write the sentence without the indirect object and it should still make sense. Therefore, the sentence without the indirect object would be "Our cousins showed us the swimming hole.".
Simply put, students with good study habits achieve better grades and are more successful in their classes.