1 - he didn’t leave earlier and it got dark
2- I don’t know it was your birthday and I didnt but you a present
3- I worked hard at uni and I have a good job
4- he didn’t tell anyone where he was going and they didn’t look for him
5- I can’t call my boss and I left my phone at home
6-you didn’t pass your driving test and you can’t give me a lift
The answer is compound because it has two predicates and two subjects. But either one if it has two of something it is compound
I feel like B has a lot of options and can open a romantic dialogue easier.
B. More than 12,000 people are homeless in the city.