decisions, decisions...(an unpaid-account poll)

Given that:
(a) I can take Harvard extension school courses for cheap in three months, and
(b) the extension school offers language classes, and
(c) I want to make a living off knowing languages, and
(d) none of the French classes they offer will do anything for me,

Which of the following should I start with? (listed in no particular order)

A. Spanish
B. Italian
C. Russian
D. German
E. Japanese
F. Chinese
G. Korean
H. Arabic
I. Hindi
J. Irish Gaelic
K. Greek