Started at first floor
went up 18 floors, so now we are at 1+18 or 19th floor
then cam down 11 floors, so now we are at 19-11 or 8th floor
then went up 16, so now at 16+8 or 24th floor
it stopped at 24th floor
B is the correct answer
hope this helps
Answer:
Both Jeff and Lori are wrong.
Step-by-step explanation:






-63 is the final answer