Question

3) Penjore was given a list of 20 courses in his postgraduate study. All the courses but 9
were compulsory. How many courses were optional?
A. nine courses were optional
B. seven courses were optional
C. eleven courses were optional
D. two courses were optional​

Answer 1

Answer:

C. nine courses were optional

all courses BUT(except) 9 were compulsory.