In 1860, the Philological Society launched its effort to create a dictionary more comprehensive than the world had ever seen; although the project would take more than 60 years to complete, the Oxford English Dictionary had been born.
A would take more than 60 years to complete, the Oxford English Dictionary had been
B took more than 60 years to complete, the Oxford English Dictionary was
C would take more than 60 years to complete, the Oxford English Dictionary was being
D would take more than 60 years to complete, the Oxford English Dictionary was
E took more than 60 years to complete, the Oxford English Dictionary was about to be
Can you please explain why B is wrong and why "would take" is a better option