Use the vertical method to multiply (4a³ - 2a + 3a² + 1) and (3 - 2a + a²) what would the value of C?

4a³ - 2a + 3a² + 1
a² - 2a + 3
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12a³ + 9a² - 6a + C
-8a⁴ - 6a³ + A - 2a
4a⁵ + D - 2a³ + 2a²
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4a⁵ - 5a⁴ + B + 14a² - 8a + 3

O -2
O 2
O 3
O 4