There are two particular cases, the first is when Object A is attracted to the neutral wall. This would indicate that the object is not neutral, as there is an attraction.
At the same time we know that Object A is attracted to an object B. And therefore, the load of A must be opposite to that of B. Remember that opposite charges attract each other. If the charge of object B is positive, then the charge of object A will be negative.
Option B is correct: It has a negative charge.
The true statement related to object A should be that it contains the negative charge.
There are two cases the first one deals when object A should be attracted to the neutral wall. This represent the object should be non-neutral, also the object A should be attracted to object B. Due to this, the load of A should be opposite of that of B. Moreover, the opposite charges should be attracted to each other. That means if object B charge is positive so the object A charge should be negative.
Therefore, the option b is correct.
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