Answer:
C
Step-by-step explanation:
First what is a point mutation?
A point mutation is a mutation that changes the sequence (simplified)
like you see in the image, the G changed to a C
A deletion mutation is a mutation that gets deleted from the sequence and that's it
A insertion mutation is a mutation that gets added into the sequence and that's it
Since nothing was added nor deleted, it is not A or B
therefore, we have C