What Specific Event Really Made It Possible for the Three

What specific event really made it possible for the three laws of planetary motion to be discovered?

A) a brilliant comet in 1601 blazed across the sky and was seen to cross in front of Venus
B) Tycho Brahe died and his assistant was able to get full access to his data
C) Galileo's books were published in Danish and became widely available to the public
D) an alignment of all the known planets in one part of the sky called everyone's attention to them
E) the plague broke out in England and forced Isaac Newton to return home from college