On a ship sailing from Hong Kong to San Francisco, a pair of twins is born. One twin is born early Friday morning, on January 1, 1965, at 1:00. Sixty minutes later, after crossing the International Date Line (and enterning a new time zone), the second twin is born on Thursday morning, at 3:00, December 31, 1964.

A. The first twin is older, because she was born 60 minutes earlier.

B. The second twin is older, because the time on her birth certificate (3:00am December 31, 1964) precedes that of her sister's (1:00am January 1, 1965).