Answer:
The subordinating conjunction is "so that" and it demonstrates a causal relationship.
Step-by-step explanation:
A subordinating conjunction is a word or phrase that introduces a dependent clause and links it to a main clause. They can add different meanings to your writing, building into the resulting sentence the relationship between the main and the subordinate clause. In this case, "so that" is a cause conjunction that illuminates the reason why the activities in the main clause were carried out.