Final answer:
A teaspoonful of neutron star material would weigh approximately 6 billion lbs due to the extreme density of neutron stars, which is significantly greater than anything found on Earth.
Step-by-step explanation:
The question concerns the weight of a teaspoonful of neutron star material. Neutron stars are incredibly dense, with densities that are billions of times greater than that of any material on Earth. A teaspoonful of neutron star material would weigh an astronomical amount due to its density. Given the options provided, and understanding the extreme density of neutron stars, the most accurate choice for the weight of a teaspoonful of neutron star would be 6 billion lbs (C). This illustrates just how dense these remnants of supernovas truly are.
Focusing on a neutron star with twice the solar mass and radius considerably smaller than Earth's, we recognize that its gravitational pull at the surface is immensely strong. This explains why an object such as a 100-kg astronaut would weigh an unfeasibly high amount, conveying the impracticality of any form of landing on a neutron star due to its immense gravity.