Because or so?

Because or so?

(made by Carmen Luisa)
Source: Grammarway 2.

Choose the correct conjunction.

Simon was put in prison... he robbed a bank.
1. because
2. so
Lisa was cold, ... she put on a sweater.
1. because
2. so
... I was hungry, I made a sandwich.
1. Because
2. So
It was my birthday, ... I had a party.
1. because
2. so
I went to bed late last night, ... I feel tired today.
1. because
2. so
I washed my clothes ... they were dirty.
1. because
2. so
She forgot to turn off the oven, ... the food was burnt.
1. because
2. so
... we were bored, we went for a walk.
1. Because
2. So
The boss was angry ... Jenny was late.
1. because
2. so
Frank's hair was too long, ... he went to the hairdresser's.
1. because
2. so