A school district claims that the average teacher in the district earns $\textbackslash$$48,000 per year. The teachers\textquotesingle{} organization argues that the average salary is less. A random sample of 25 teachers yields a mean salary of $\textbackslash$$47,500 with a sample standard deviation of $\textbackslash$$2,000. Assuming that the distribution of all teachers\textquotesingle{} salaries is approximately normally distributed, what is the value of the t-test statistic and the P-value for a test of the hypothesis H\textsubscript{0}:~$\mu$~= 48,000 against H\textsubscript{a}: $\mu$ \textless{} 48,000? (Remember, df= 25 - 1 = 24.) 
选项为:A:t=1.25, 0.10\textless P\textless0.15  B:t=-1.25, 0.20\textless P\textless0.30  C:t=1.25, 0.20\textless P\textless0.30  D:t=-1.25, 0.10\textless P\textless0.15  E:t=-1.25, P\textgreater0.25  请回答其中一个选项.