Inferior. 'Sub' as a prefix means 'under' or 'below', and indicates that the subject is in a relatively small proportion.
Answer:
Her car's brake lights were faulty.
Abdul's finishing time in the marathon was twenty minutes faster than his previous best.
The stadium's lights dimmed just before the band came out.
He had ten years' experience in catering.
The women's toilets were out of order.
The children's toys were packed in a box.
I don't think so because some students learn from homeworks and the test is basically about the homework.
For sure W because nobody at the time knew why people did these type of things