Has the marrying age of a man changed over the years? The United States Bureau of the Census takes a formal count of everyone in the U.S. every 10 years and has provided the following data that gives the median age of an American man at the time of his first marriage.Year1910192019301940195019601970198019902000Median Age25.124.624.324.322.822.823.224.726.126.8What does a rate of change of zero mean in this situation?a.The median age of a man at the time of his first marriage is, on the average, constant.b.The median age of a man at the time of his first marriage is, on the average, decreasing.c.The median age of a man at the time of his first marriage is, on the average, increasing.d.The rate of change cannot be zero in this situation.