The correct answer is a:
Et tu, Brute?
it means "you too, Brutus" and refers to the fact that he did not expect Brutus to be against him like the other people.
The author wants to show that he is a superstitious person
<em>the other term for this is <u /><u>sparsely populated..
</u>mean the area under observation does not have enough crowd or people... they may be audience in a cinema or public or citizens in a city...<u>
</u></em>