Let's simplify the expression step by step:

Given expression: $2x - 6y + 3x^2 + 7y - 14x$

1. Combine like terms:
   • For the $x$-terms: $2x - 14x = -12x$
   • For the $y$-terms: $-6y + 7y = y$
   • The $3x^2$ term stays as it is.

So, the simplified expression becomes: $3x^2 - 12x + y$

Thus, the correct answer is: 3x² − 12x + y

Would you like further details or have any questions?

Here are 5 related questions for deeper understanding:

1. How do you identify like terms in an algebraic expression?
2. What would the result be if we had $-2x^2$ instead of $3x^2$?
3. How would the expression change if there were no $y$-terms?
4. Can you simplify $5x + 3x^2 - x + 7x^2 - 2x$?
5. What is the role of coefficients in simplifying expressions?

Tip: Always group like terms when simplifying expressions, which include terms with the same variable and exponent.