Which was the catholic church’s most powerful tool in maintaining its authority in medieval europe

a. its missionary

b. its monasteries and convents

c. its control over the sacraments

d. its hospital and schools

what are the options ?

there were abundant sources of fuel nearby

seeing as no choices were provided, i'll do my best to answer it from knowledge.

job specialization promotes work ethic to the person doing the job. he/she may be strong in the arms and able to lift things, specializing him/her in a job where you lift and carry.