Before 1896, many scientists concluded that light could not pass through black paper. In 1896, Henri Becquerel observed that uranium salts could cause a plate covered by black paper to react as if light had reached it. How did this observation affect conclusions about light passing through black paper? A- Scientists ignored Becquerel’s evidence because uranium is dangerous to use, so his study was not valid.

B- Scientists repeated Becquerel’s experiment until it no longer worked and reported that his conclusions were not valid.

C- Scientists had to revise their earlier conclusion because evidence from Becquerel did not support the original conclusion.

D- Scientists stood behind the earlier conclusion that black paper blocks light because it was already an accepted conclusion.