In 1972,one Could Buy Model Rocket Engines for $1

Multiple Choice

In 1972,one could buy model rocket engines for $1.50 each.If those same engines cost $2.50 each today,then which pair of CPIs would make the engine prices in today's dollars the same for both years?

A) 60 in 1972 and 95 today
B) 60 in 1972 and 120 today
C) 90 in 1972 and 150 today
D) 96 in 1972 and 154 today