In a certain school, there are 200 students in Grade 7. One hundred and twelve (112) students study Korean 85 students study Mandarin, and 75 students study Spanish Forty - seven (47) students study both Korean and Mandarin 33 students study Mandarin and Spanish only. Find the number of students who study;
A. all three languages
B. Spanish only
C. Neither of the languages
D. at least one language​