X and Y were born on the same year on planet LOL (event O). On their 60th birthday, X discovered a star explosion that is 70 light years away from LOL (event X). Similarly, on their 70th birthday, Y discovered a different star explosion that is 80 light years away from LOL (event Y). X calculates the proper distance between events O and X while Y calculates the proper distance between events O and Y. Who will obtain the largest proper distance?

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X and Y were born on the same year on planet LOL (event O). On their 60th birthday, X discovered a star explosion that is 70 light years away from LOL (event X). Similarly, on their 70th birthday, Y discovered a different star explosion that is 80 light years away from LOL (event Y). X calculates the proper distance between events O and X while Y calculates the proper distance between events O and Y. Who will obtain the largest proper distance?

A. Proper distance cannot be obtained for these pair of events.
B. X
C. Y
D. They will calculate the same proper distance

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