The best statement that describes the location of the sun according to the heliocentric model of the universe is: The sun is located at the center of the solar system. However, note that the options you provided do not include this accurate description of the heliocentric model, which states that the sun is at the center of the solar system, with planets, including Earth, orbiting around it.
None of the responses given are accurate in the context of the heliocentric model. If I must choose from your options, the closest (though still incorrect) might be "The sun is located closest to Earth," as it is true relative to other stars but still not accurate in describing its role in the solar system layout.