Right to a defence

Which fundamental right of Samuel is violated when he is told that he cannot have a legal representation in the trial?

Samuel is an activist and lives in a country that has a politically repressive regime. He is accused of participating in a peaceful protest against the government's policies. The government, in an attempt to suppress him, informs that he is not allowed to have legal representation in the trial. He is left with a choice to defend himself during the trial.

Choices:

A) The right to a speedy trial

B) The right of peaceful assembly

C) The right to remain silent 

D) The right to legal representation