$$Totalstudents=25$$

$$Medianscore=80$$

No 2 students got the same test score.

The median for an odd number of terms is

$$Median=(\frac{n+1}{2}{)}^{th}$$

The median of 25 terms is

$$Median=(\frac{25+1}{2}{)}^{th}={13}^{th}term$$

As students got distinct scores so all the 25-13=12 students above 13th got scores greater than 80. Therefore, choice B is correct.