A

Step 1: Understand the concept of weight in relation to gravity. Weight is the force exerted by gravity on an object. It is given by the formula:
$$ W = mg $$
where W is weight, m is mass, and g is the acceleration due to gravity.

Step 2: Consider the astronaut in an artificial satellite. An artificial satellite is in orbit around the Earth, which means it is in a state of free fall. In this state, the gravitational pull on the astronaut is counteracted by the centripetal acceleration required to keep them moving in a circular path.

Step 3: Since the astronaut and the satellite are falling together towards the Earth, the astronaut does not experience the sensation of weight, and thus the effective weight can be considered to be zero.

Conclusion: Therefore, the weight of the astronaut in an artificial satellite is effectively zero.