Justice Minister Bola Ige, confronted with the general incivility of local police, placed a ______ on the cads. Said the Hon. Bola Ige, “I pray that God will make big holes in their pockets.”

We can infer that the Justice is annoyed by the local cops and wishes that they suffer. 
Let us evaluate the options. 
Plea means to request. The Justice is not placing a request. He is cursing the local cops. Therefore, we can eliminate this option. 
Sanction means to place a penalty. From the statement, we can infer that the author is not talking about a legal recourse. We can eliminate option A as well.
Proscription means to prohibit. 'Prohibit' does not fit in well with the context of the given sentence since the Justice did not prohibit the cops from doing something.
Malediction is a term used to indicate a curse. This word fits in the blank given in the sentence. Therefore, option A is the right answer.