Less. If you multiple 1 2/5 by $2.99 you would get about $4.19. If you multiple 2 3/10 by $2.99 you would get about $6.88. If you add those together, you would get $11.07, which is less than $12.
Add the who numbers: 4 + 2 = 6
You are correct, it's C. 6
All real numbers greater than or equal to 1