The correct answer is B) since he felt insecure about educated intellectuals he had to avoid presenting a logical argument.
The difficult task did Stalin most likely face when he tried to use logos in his speech was "since he felt insecure about educated intellectuals he had to avoid presenting a logical argument."
That is why he better used Pathos in his speech, the appeal to the emotions to convince people. He found difficult to use Ethos also because he had to make himself seem trustworthy to his people despite he had starved and tortured many Soviets.
Let's remember what Ethos is. Ethos is the ethical appeal in the discourse. You use Ethos when you want to convince an audience through your reputation, credibility or character.
The other two elements are Pathos, the use of emotions to appeal to an audience, and Logos, the use of logic or reason to appeal to an audience.
When Britain started implementing stricter measures on their colonies' trade and other affairs, the colonies didn't like it.
Rome was a republic before it was an empire. Romans had the first Senate, elected by the people. The third option is also correct, because even the if the emperor did something that was against the law, he would be put on trial. Also the last one, those are called "Law's" You find them everywhere. xD Hope I helped :)