Option 1 -> Includes (B) which is incorrect as blue denotes maximum, not minimum temperature.
Option 2 -> Correctly includes (A), (C), and (D) - all true statements about stars and neutron stars.
Option 3 -> Includes (B) which falsely claims blue denotes minimum temperature, when blue stars are actually the hottest.
Option 4 -> Includes (B) and excludes (D), making it incorrect on both counts.
Hence, Option 2: (A), (C) and (D) only -> Statement (A) is correct as star color directly correlates with surface temperature. Statement (B) is FALSE because blue indicates MAXIMUM temperature (25,000K+), not minimum - red stars are coolest. Statement (C) accurately describes neutron stars' compact size (20 km diameter) and typical mass (1.4 solar masses, the Chandrasekhar limit). Statement (D) is correct as neutron stars form from supernova explosions when massive stellar cores collapse -> correct