The order of ionisation of alkali group follows which order?

Q. The order of ionisation of alkali group follows which order?

A.            Li>Na>K>Rb>Cs

B.            Li<Na>K<Rb>Cs

C.            Li<Na<K<Rb<Cs

D.            Li>Na<K>Rb<Cs

Answer: Li>Na<K>Rb<Cs