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Math·Algebra·Linear equations in two variables

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Each $3.0$-ounce serving of cheddar cheese and each $1.2$-ounce serving of tuna provides about $1$ microgram of vitamin B12. If a total of $2.1$ micrograms of vitamin B12 are consumed from eating $x$ ounces of cheese and $y$ ounces of tuna, which equation best represents this situation?

A

$1.2x+3.0y=2.1$

B

$0.83x+0.33y=2.1$

C

$3.0x+1.2y=2.1$

D

$0.33x+0.83y=2.1$