Concept:Local time changes by 1 hour for every 15∘ of longitude, and places to the west have earlier time than places to the east.Explanation:The wife is on longitude 30∘E, while the husband is on longitude 30∘W.Total longitude difference = 30∘+30∘=60∘.Time difference = 15∘60∘=4 hours.The husband is west of the wife, so his local time is behind the wife's local time.The wife's time is 1:00 am on Monday.Subtract 4 hours from 1:00 am Monday.1:00 am Monday - 4 hours = 9:00 pm on Sunday.Thus, the husband will pick the call at 9:00 pm on Sunday local time.Answer:9 pm (Option D).