\textbf{If I toss a fair coin 5000 times} 
选项为:A:\textbf{and I get anything other than 2500 heads, then something is wrong with the way I flip coins.}  B:\textbf{the proportion of heads will be close to 0.5}  C:\textbf{a run of 10 heads in a row will increase the probability of getting a run of 10 tails in a row.}  D:\textbf{the proportion of heads in these tosses is a parameter}  E:\textbf{the proportion of heads will be close to 50.}  请回答其中一个选项.