In sample #1, data are collected for three couples. Xi measures the height of the ith man, and Yi measures the height of the ith man's girlfriend. The correlation between X and Y is calculated to be exactly -1. It is _ that some of the ment in sample #1 have girlfriends who are taller than themselves while other men in sample #1 have girlfriends who are shorter than themselves. It is _ that all three of the men in sample #1 have girlfriends who are shorter than themselves. A Possible, Possible. B possible, not possible. C not possible, possible. D not possible, not possible