Between Two Given Years,if Real GDP and Nominal GDP Grow

Multiple Choice

Between two given years,if real GDP and nominal GDP grow at the same rate,then:

A) the price level increased.
B) prices must have remained constant between the two years.
C) quantities must have remained constant between the two years.
D) prices and quantities must have remained constant between the two years.
E) prices and quantities must have grown at the same rate between the two years.