Answer :
There are a lot of mechanic engineers. From the above scenario, Neither A or B is correct.
What should you remove first?
In the act of disconnecting the cables from any old battery, it is better to disconnect the negative first, then later on the positive.
When connecting the new battery in a kind of reverse order, the positive one comes first and then the negative one. When a person is replacing their car battery, It is not easy to known the order in which to disconnect the terminals but always known the negative before positive one.
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