The incidence of common colds in a double-blind study involving 279 French Skiers is summarized in the following table. 

                  Cold    No Cold   Totals     
Placebo 	  31	  109	    140        
Vitamin C	  17	  122	    139        
Totals		  48	  231	    279
When testing the null hypothesis that Vitamin C has no therapeutic value for treating common cold we obtain (choose one):

a) Chi-square = 2.7 , p-value > 10%. Can't reject
b) Chi-square = 4.8 , p-value > 10%. Can't reject
c) Chi-square = 7.8 , p-value < 1%. Reject
d) Chi-square = 3.9 , p-value < 5%. Reject
e) Chi-square = 4.8 , p-value < 5%. Reject