A pot of the kinetic energy `(1//2mv^(2))` of ejected electrons as a functionof the frequency (v) of incident radiation for four alkali metals `(M_(1),M_(2),M_(3),M_(4))` is shown below.
The alkali metals `M_(1),M_(2),M_(3)andM_(4)` are, respectively-
A. Li, Na, K, and Rb
B. Rb, K, Na, and Li
C. Na, K, Li and Rb
D. Rb, Li, Na, and K