For each blank select one entry from the corresponding column of choices. Fill all blanks in the way that best completes the text.

Modern tennis fans have come to realize that, although, quantum technological leaps in racquet technology have lead to _______ increases in the speed and power with which players can hit the ball, this has not necessarily lead to a more entertaining game.

a. Innocuous 

b. Halcyon 

c. Malleable 

d. Commensurate 

e. Tractable