((FAN+MEDAL)))Which transitional word correctly begins the second sentence in this paragraph?

Like many realist writers, Tolstoy uses a simple writing style in his novella The Death of Ivan Ilych. _______ much of what the author tells readers about Ivan Ilych’s state of mind is not matter-of-fact description. Tolstoy is in effect conveying his protagonist’s despair at his approaching death.
-Moreover
-but
-although
-therefore

Question

((FAN+MEDAL)))Which transitional word correctly begins the second sentence in this paragraph?

Like many realist writers, Tolstoy uses a simple writing style in his novella The Death of Ivan Ilych. _______ much of what the author tells readers about Ivan Ilych’s state of mind is not matter-of-fact description. Tolstoy is in effect conveying his protagonist’s despair at his approaching death.
 -Moreover
-but
-although
-therefore