What Would Help Scientists Probe the Period from Zero Time $10 - 43$

What would help scientists probe the period from zero time to $10 - 43$ second?

A) discovery of a white hole, with matter and energy flowing out
B) more sophisticated gravity wave detectors
C) a theory incorporating the force of gravity into existing GUTs
D) a better understanding of the nature of dark energy
E) more detailed observations of the cosmic microwave background