Welcome to another terrible multiple choice question. They get worse, don't they? Obviously all of those options would fit. It is also impossible to test words like school, university and college because they overlap,and because every English-speaking country uses them differently. I agree with the wonderfully named Hamlet D'Arcy, though. I think that the daft person who wrote this was trying to rule out 'university' and 'college' by using the word 'pupils'. 'Pupils' suggests schoolchildren rather than college- or university-aged students, so I'm guessing that they want you to put 'school'. NB Further to Mr H D'A's comment about the term 'pupil'. In fact, we don't use 'pupils' in British schools: it is very outdated. You might come across it in a historical context - for example, in a biography of a nineteenth-century schoolteacher - but it is rare to hear it in modern contexts. These days, even schoolchildren can be referred to as 'students'.

This is a horrible test. US English - "School" is the answer that sounds best to me. BUT part of that is because we don't say "at university." So that answer sounds odd, not wrong, just odd. we would also not likely say "at college" in this scenario. But "There are 30 pupils in my class in college." is almost a perfectly normal thing to say. The problem is that no one says "pupils." It shows up in formal writing, but no one says it. The normal-er thing to say would be "There are 30 students in my class in college." Or more likely "There are 30 students in my class."

US - yes, we use the word "class" with colleges and universities.

Thank you, Hamlet D'Arcy! What about 'class'? Is it possible to use 'class' when talking about 'university'?

Native US English speaker with Masters degree. I would say school. A pupil typically means a younger student. College and universities have students. Elementary schools have pupils. Beware, pupil is more used in British English. In Be i believe school is definitely the correct answer.