Which passage most clearly uses a logos appeal?

a. so we are going to win the war and we are going to win the peace
that follows.

b. when we resort to force, as now we must, we are determined that
this force shall be directed toward ultimate good as well as
against immediate evil. we americans are not destroyers - we are
builders.

c. i deeply feel the anxiety of all of the families of the men in our
armed forces and the relatives of people in cities which have been
bombed.

d. knowing that the attack might reach us in all too short a time, we
immediately began greatly to increase our industrial strength and
our capacity to meet the demands of modern warfare.