What, to the american slave, is your 4th of july? i a day that reveals to him, more than all other days in the year, the gross injustice and cruelty to which he is the constant victim.

which of the four dictionary definitions for the word reveals is least effective as it applies in this sentence?
a) to enlighten
b) to lay open to view
c) to expose or uncover
d) to divulge what was confidential