If two laws conflict with each other, the court must decide on the operation of each. . [t]he constitution . . must govern the case to which they both apply.
the excerpt describes
a.
the principle of judicial review.
b.
the balance of power between branches.
c.
the system of checks and balances.
d.
the limitations of the supreme court’s power.

The best and only answer to your question is the excerpt describes  
A.the principle of judicial review.

The principle of judicial review excerpt describes as if two laws conflict with each other, the Court must decide on the operation of each. The Constitution must govern the case to which they both apply.    

Hope my answer would be a great help for you.      

B. it promoted the powers of the executive branch