Answer: b. It looked like she could knock it over by sneezing, but it was good enough for her to practice shooting.
Explanation:
Something that is rickety is not very stable and could collapse at anytime.
In calling the item rickety and thinking that it could be blown over by sneezing meaning it could collapse at any time, the author is helping us understand that rickety means unstable much like the chair which is unstable and prone to collapse at a mere sneeze.
They both promised fair to grow up as rude as savages; the young master being entirely negligent how they behaved, and what they did, so they kept clear of him.
He would not even have seen after going to church on Sundays, only Joseph and the curate reprimanded his carelessness when they absented themselves; and that reminded him to order Heathcliff a flogging, and Catherine a fast from dinner or supper.
Hindley in a passion told us to bolt the doors, and swore nobody should let them in that night.