Causation can be proved by using a(n):
a
negative correlation.
o
b. experiment.
o
c. observatior..
d. hidden variable.
answer : !

I would say B

Explanation:

To prove Causation you need a random experiment. This could mean D because random experiments entail hidden variables but I think your best bet is B because its what's the use of a hidden variable without an experiment.

from the original order (top to bottom) the new order will go

1 (founder)

4 (hawk)

2 (mutate)

3 (next generation)

make   gliitsh plesea   !