Read the given paragraph and select the option which correctly fills the blanks. When stars run out of fuel in their core, they bloat into___ (i) ___giants. After a few million years, the outer layers begin to 'puff off', forming a planetary nebulae, leaving behind only the dead core of mostly ___ (ii) ___ fill and __ (iii) _. They then become ___ (iv) ___ dwarf stars.

• A. i-Blue ii-Oxygen iii-Carbon iv-Red
• B. i-Red ii-Methane iii-Oxygen iv-Blue
• C. i-White ii-Carbon iii-Methane iv-Red
• D. i-Red ii-Carbon iii-Oxygen iv-White