Conditions for germination : air, warmth and moisture (water)
Since all 3 set-ups have these conditions, germination will occur. Light is not needed for germination because the seed leaves provide food for the seed before it becomes a young plant. Whether there is light or not, germination will occur as long as these conditions are present.
I think students get confused when additional (yet not relevant) information is given. This is to test how strong is their foundation. Students who are not dead sure on the conditions for germination will try to make a guess and this question does not allow that.
Looking at the question, seems like it is set up to make students with weak foundation think
“Oh, there are containers made with 3 different materials. This question must have got to do with the materials (glass allow light to pass through). It has to do with light if not they use different materials for what ?”
One group of student will choose A because they got confused with photosynthesis. Another group will carelessly choose B and C only because they remember light is not needed for germination. Again, I wanna stress that Whether there is light or not, germination will occur as long as these conditions are present. Only students who understood this will choose 4 (A,B and C)
Answer : 4