Discussion
Which conclusion follows from a large variation between cells?
Answer: C
A difference of more than about fifty points of specific gravity between cells indicates an internal fault that charging will not cure. A low level does affect a reading, which makes the last option a genuine check to make first. The shared behaviour explains why these belong together and the differences explain why both exist. Naming what changes and what stays the same is the reliable route through questions of this shape. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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