Number 1 but just reworded in diffrent way
One of the effects of the black death on Europe was social and economic Upheavals.
The Black that killed almost 60 % Person of total population in Europe. After the incidents, a lot of Lands became free and provide the survivors with a lot of opportunities which increased the prosperity for those who managed to survive
Efficacy is getting matters. it's far the potential to produce a desired amount of the desired effect or fulfillment in attaining a given intention. efficiency is doing things in the maximum low-priced manner. it's far the ratio of the output to the inputs of any device (appropriate input to output ratio).
Efficacy and effectiveness are close enough which means that they're regularly used interchangeably in contexts. however, effectiveness is regularly extra especially used inside the context of the way something accomplishes an assignment while efficacy conveys the quantity to which something accomplishes its task in any respect.
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The one that is a popular music is : c. Secular music
Secular music is all the things that are not associated with religious music. Religious music seems to be not very popular in the world
hope this helps
