There are 5 red, 2 yellow and 7 white roses in a flower case. if a rose is selected randomly. The probability of the selection of white rose is 

(a) 

(b) 

(c) 

(d) 
1 
There are 5 red, 2 yellow and 7 white roses in a flower case. if a rose is selected randomly. The probability of the selection of white rose is 

(a) 

(b) 

(c) 

(d) 
1 