What is judicial review?

a.) the chef justices review of the associate justices

b.) when the court rules against the defendant in a case

c.) the courts examination of the constitutionality of the actions of congress and the president

d.) a congressional check against the actions of the judicial branch

Judicial review is when the judicial branch, particularly the US Supreme Court, holds a law, statute, treaty, etc. up for review to examine whether or not it is legal.
In other words, judicial review is a power of the judicial branch to state that an action of another branch was unconstitutional.
That means the answer is C.) the courts examination of the constitutionality of the actions of congress and the president.

Hope this helps!

Of the revolutions of 1848.