Step-by-Step Solution
The acceleration on the object deceases with increase in height or depth from the Earth Surface.
The acceleration due to gravity decreases with altitude from the Earth surface. The weight of the object would weigh less when it is at an altitude from the Earth surface.
Hence, the options (c) and (d) are wrong.
The mass of the object on the Earth surface is weight divided over the acceleration due to gravity so,
The equation for the acceleration due to gravity at an altitude from the Earth surface is
Here 
is the universal gravitational constant, 
is the mass of the Earth, 
is the radius of the Earth and 
is the altitude.
Substitute
, 
, 
and 
so
The weight of the object at an altitude from the Earth surface is
So, option (a) is wrong.
The weight of the object is
.Therefore, the correct option is 
.
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