Hello!
The answer is: The acceleration of the object B is half of the object A.
Why?
We can solve this problem applying the Newton's Second Law, which states that the product of the mass and the acceleration of a body is equal to the force applied to that body.

So,
For the object A, we have:

Calculating the acceleration we have:
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For the object B, we have:

Calculating the acceleration we have:
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Hence,

So, what is true about the acceleration of object A and object B?
The answer is that the acceleration of the object B is half of the object A acceleration since the mass of the object B is two times the mass of the object A.
Have a nice day!