Answer:
1/4
Step-by-step explanation:
The weight of an object is given by:

where m is the mass of the object and g is the acceleration due to gravity on the planet.
We are told that object C and object D have same weight, so we can write:

where:
is the mass of object C
is the mass of object D
We can re-arrange the equation to find a relationship between the gravity acting on object C and the gravity acting on object D:

So, the gravity acting on object C is 1/4 times the gravity acting on object D.