With which scientist did William Ramsay show in 1894 that air also contained an element unknown until then, which was named argon?

Correct option is A

William Ramsay worked with Lord Rayleigh when they discovered the noble gas argon in 1894. This discovery was pivotal as it led to the identification of the noble gases as a new group in the periodic table.
 Hermann Staudinger was a German organic chemist who demonstrated the existence of macromolecules, which he characterized as polymers. For this work he received the 1953 Nobel Prize in Chemistry.
 Glenn Seaborg Glenn Theodore Seaborg was an American chemist whose involvement in the synthesis, discovery and investigation of ten transuranium elements earned him a share of the 1951 Nobel Prize in Chemistry.
 Harold Urey Harold Clayton Urey was an American physical chemist whose pioneering work on isotopes earned him the Nobel Prize in Chemistry in 1934 for the discovery of deuterium.