When Czar Alexander II issued an edict in 1861 ending serfdom, he also ordered that <span>serfs would continue to live and work in their communities. The correct option among all the options that are given in the question is the second option or option "B". I hope the answer has come to your help.</span>
I believe the correct answer is: The theory of universal
gravitation.
The famous anecdote of an apple falling from a tree and
striking the head of the young Sir Isaac Newton which stroke the great idea,
helped him come up with The theory of universal gravitation, as a concept and
ever present force.
Not 100% sure, but I think its D.
