A little part of him held out hope , though ; he knew he and Jack , although ten years apart in age , were a good match . He sat forward again and looked down at the bench ; the players ' backs were to him , and he saw the guys moving around . Ennis stood behind the players with the coaches , but Brady noticed that his hand rested on Jack 's shoulder pads and he made no effort to hide or move it . I ' m fucked , thought Brady .

Choices: a. It is against the law for someone to date someone more than 10 years apart in age .; b. None of the above choices .; c. It means their birthdays are too far apart to be legally involved .; d. It means they have less in common and have different types of friends .;
Q: Why would someone being 10 years apart in age be a challenge ?
d.