JEE Main Chemistry question

Consider the following reaction equilibrium . Initially, 1 mole of and 3 moles of are taken in a 2 L flask. At equilibrium state if the number of moles of is 0.6, what is the total number of moles of all gases present in the flask?

• (A)0.8
• (B)1.6
• (C)3.2Correct
• (D)6.4