Answer:
Complex sentence.
Explanation:
I’m not that sure, but there is a subordinating conjunction ‘if’, and ‘if the bus is late’ is a dependent clause, whereas ‘Britta will have to walk to work.’ is an independent clause, which makes it a complex sentence structure.
B.
"Stay where you are and we will send someone as soon as possible," the police officer had assured him.
Public speaking is more people while conversation is between less audience.