Answer:
C. 6x + 9 - 3x^2
Explanation:
We have 4 expressions and are being asked which has 3 terms.
When it comes to terms, terms are numbers that are different, it could be separated through a variable, square root, symbol, e.t.c.
So when looking for an answer, we need 3 numbers with different variables or symbols, let's look
A. only has two, 10x and 8. Therefore it is wrong.
B. has 4 terms, 3x^3, 6x^2, 9x, and 12. Therefore it is wrong.
C. is correct because it has 3 terms, 6x, 9, and 3x^2.
D. has 2 terms, 833 and 12x, though 16 is there, it is the same as 833, therefore not counting it as its own term.