Welcome to your interview.
The question is on your right: Merge Sort Complexity Explanation. Take a moment with it first.
Talk your thinking through with me if you like - when you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes). Discussion and graded submissions share your five interviewer interactions, so spend them well.
Explain the time and space complexity of merge sort, and why you would choose it over simpler sorting algorithms in some cases.