Task: Question Answering
Input (English): Question: A certain junior class has 100 students and a certain senior class has 80 students. Among these students, there are 6 siblings pairs each consisting of 1 junior and 1 senior. If 1 student is to be selected at random from each class, what is the probability that the 2 students selected will be a sibling pair?

 Option A: 3/40000

 Option B: 1/3600

 Option C: 9/2000

 Option D: 3/4000

 Option E: 1/15
Output (English): Option D