Option b best describes synthesis!
If Macbeth's conscience had caused him no moral suffering, then he would be an out-and-out villain, somewhat like Shakespeare's Richard III. However, Shakespeare wanted to make Macbeth a somewhat sympathetic figure so that his downfall would seem somewhat tragic
The correct plural form of echo is echos or echoes. Either way it is grammarly correct. I believe that echoes is the correct form.
echoes
Tybalt hears and recognizes romeos voice.
