In what context does the words describe jimmy?
The least common multiple of 9 and 6 is 18 so in 18 months she will replace the bulb for the 2nd time and the air filter for the 3rd time. It will be the first time they are replaced together.
B and C seem like they are just giving information about the question, instead of answering it. A seems like a legitimate answer
I would say "D" I hope this helps you!
