Otto Hahn and Fritz Strassmann Discovered Fission by Bombarding Uranium

Multiple Choice

Otto Hahn and Fritz Strassmann discovered fission by bombarding uranium with neutrons. Their discovery was made possible by finding one of the fission products, barium (Ba, atomic no. = 56) . What is a reasonable explanation for why they were unable to initially observe the other product, krypton (Kr, atomic no. = 36) ?

A) Krypton is a noble gas and it may have diffused out of the sample.
B) The isotope of krypton generated might have undergone radioactive decay to some other element.
C) Krypton is a noble gas and therefore chemically unreactive, making it difficult to characterize by chemical means.
D) all of the above