Measured in absolute numbers, the level of immigration during the 1990s into the United States was _________ compared with the levels of previous decades.When considered as a percentage of the population at the time,the level of immigration into the United States during the 1990s was ________ than the levels experienced during the earlier decades of the twentieth century.

A. lower, higher
B. lower, lower
C. higher, lower
D. higher, higher