The answer is A. even
Quick information:
3di - three digit interstate
2di- one-digit or two-digit interstate
Bypass routes - preceded by an even number in the first digit.
Interstate highways are identified by one or two. Odd route numbers runs north and south while even route numbers runs east and west. Even starting digit means the 3di (3-digit) meets another interstate at both ends (loop). We call them as beltways and bypasses.
