Why Were the High Concentrations of Noble Gases Found in Jupiter's

Why were the high concentrations of noble gases found in Jupiter's upper atmosphere such a surprise?

A) Noble gases are not generally found in the outer solar system.
B) At Jupiter's distance from the Sun, it was too warm for these gases to solidify when the planets were forming.
C) These elements normally combine with other elements and are not found directly.
D) High concentrations are only found in the atmospheres of terrestrial planets.