The given question is asking about the mass of a body based on its weight. The weight of a body is the force exerted on it due to gravity. In this question, the weight of the body is given as 9.8 N. It is also mentioned that the acceleration due to gravity, g, at the place is 9.8 m/s^2.
To find the mass of the body, we can use the formula: Weight = mass x acceleration due to gravity (W = mg).
Plugging in the given values, we have: 9.8 N = mass x 9.8 m/s^2.
Simplifying this equation, we can see that the mass of the body is equal to 1 kg.
Therefore, option 4, 1 kg, is the correct answer.
It is important to note that mass is a fundamental property of an object and is constant regardless of the location or gravitational force acting on it.