According to information provided by the passage, which of the following stars would astronomers most likely describe as a planetary nebula? A. A star that began its life with a mass of 5.5 Mʘ, has exhausted its nuclear fuel, and has a core that is visible to astronomers B. A star that began its life with a mass of 6 Mʘ, lost mass at a rate of 1 Mʘ per 10,000 years, and exhausted its nuclear fuel in 40,000 years C. A star that has exhausted its nuclear fuel, has a mass of 1.2 Mʘ, and is surrounded by a circumstellar cloud that obscures its core from view D. A star that began its life with a mass greater than 6 Mʘ, has just recently exhausted its nuclear fuel, and is in the process of releasing massive amounts of gravitational energy E. A star that began its life with a mass of 5.5 Mʘ, has yet to exhaust its nuclear fuel, and exhibits a rate of mass loss similar to that of IRC+10216