Good Afternoon!

Could you please help explain this derivatives finance question to me? Thanks!

Using a one-period binomial model where So = 45, Su = 49.5, Sd = 40.5,

=0.8, r = 0.06, X = 50, then the European put value at t=0 is closest to:

A)2.17

B) 5.00

C) 0.50