A coin is tossed 500 times and head is obtained 280 times. On tossing a coin at random, the probability of getting a tail is

• A.  \[\frac{1}{99}\]                                 
• B. \[\frac{1}{2}\]
• C.  \[\frac{3}{50}\]                       
• D.  \[\frac{11}{25}\]