单选题 It is surprising that eating three meals a day—breakfast, lunch and dinner—has been a custom only since 1890. Before this time, people only had two meals a day—breakfast and dinner. In the 16th century, breakfast was only to break one's fast (开戒). But 200 years later it became a large meal, not just for family, but for numbers of guest as well. It was a social event. It began at 10:00 a.m. and lasted until 1:00 p.m. Then breakfast began to be less popular. It became, instead, a lighter meal and was taken at a much earlier hour. By 1850, it had been pushed back to 8:00 a.m. and become a family meal. Dinner, however, went the other way. In the 16th century it was eaten at 11:00 a.m. Years later, it moved to the early afternoon, then to 5:00 p.m. By 1850, dinner time had reached 7:00 p.m. Lunch is a recent idea. It first appeared as a snack to fill the gap between breakfast and dinner. People did not have lunch ______