The degree of a product of polynomials is the sum of the degrees of the individual polynomials.
- The degree of \( 3x^2 - 7x + 2 \) is 2.
- The degree of \( 2x^4 + 3x^3 - 5x + 2 \) is 4.
Thus, the degree of the product is:
\[
\text{Degree of product} = 2 + 4 = 6.
\]
Thus, the correct answer is \( \boxed{6} \).