A Look at the Historical Data Indicates That Velocity for M₁

A look at the historical data indicates that velocity for M₁

A) has been more variable than the velocity for M₂, but both have been fairly constant for the past 65 years.
B) and M₂ have both trended downward, but velocity for M₂ has been more erratic than velocity for M₁.
C) has been fairly constant for the past 65 years, but velocity for M₂ has trended downward.
D) has trended upward in the past 65 years, but velocity for M₂ has been more constant.