What was the main strength of the feudal system in medieval europe?

a
it allowed art, learning, and architecture to flourish.
b
it offered protection from threats like the black death.
c
it allowed many levels of society to give benefits to one another.
d
it created a system in which both catholics and protestants could do well.
.

Match the people with the appropriate description. vernon and irene castle arthur murray fred astaire willi ninja a. stylized the forms of ballroom dance by incorporating other dance forms b. responsible for renewing the influence of ballroom dance in america c. godfather of vogue danced. responsible for standardization/teaching of steps leading to spread of ballroom dance education