Answer:
The correct answer is D) All of these
Step-by-step explanation
Hindsight is the only exact science.
Even today with the advent of big data and predictive analytics using very powerful statistical models and artificial intelligence, there are still degrees of uncertainty that must accepted.
The great scientists mentioned above made some of these predictions based on gut instincts which is largely conditional.
Little wonder why their predictions were so far off.
Cheers!