Question

democracy is more effective than its other alternatives. justify the statement.

Answer 1

It grants us many things. 
1.Right to speech.
2.Right to information.
3.Right to vote and etc.
It represents each and every citizen equally whether you are poor or you are rich.
In a monarchy or dictatorship no one can say or present their point of view. They have to follow what a single man says but in democracy we have been granted by RIGHT TO SPEECH.

Answer 2

Democracy is more effective because its gives people choice to select their leader, gives freedom to speak etc. While this can't given in another alternatives