Which of the following is not a trend seen in the temperature anomaly measurements between AD 1850 and "today"?
A) A fairly steady global temperature between AD 1850 and AD 1910.
B) A gradual increase in global temperature between AD 1945 and AD 1975
C) A gradual increase in global temperature between AD 1910 and AD 1945
D) A steep and sharp rise in global temperature between AD 1975 and present.