The answer is C: the characters often face problems related to future technological advancements.
Science fiction is usually set in dystopian and futuristic scenarios where the advancement of technology has presented the characters in the story with novel social and personal problems that are to be solved. Science fiction, thus usually represent fictional problematics that, given the light that the story sheds on these problems, can be incorporated into a current critique of contemporary and actual social and personal conditions.
The answer would be C, because science fiction is based on futuristic stories. Or, it can also be described as what people imagine the distant future to be like.
Counting by 7s' main character is Willow Chance, a little girl who has lost two sets of parents in her short life - she never knew her blood parents and her adoptive ones die in a terrible accident.
