Concept:Time difference between a place and Greenwich is used to find its longitude. Each hour equals 15∘ of longitude.Explanation:Local time at X is 12:00 noon, while GMT is 5:00 a.m.Time difference = 12:00−5:00=7 hours.Since X is ahead of GMT, X is east of the Prime Meridian.Longitude difference = 7×15∘=105∘.Thus, X is located on 105∘ East longitude.Answer:C. 105∘E