The dividing meridian between zone descriptions -2 and -3 is __________.

Correct Answer: Option C — 37°30'E

Time zones span 15 degrees of longitude. Zone -2 centers on 30 degrees East, and Zone -3 centers on 45 degrees East. The dividing boundary lies exactly halfway between them at 37 degrees 30 minutes East, per standard international time zone demarcation rules outlined in Bowditch.