For δabc, ∠a = 4x + 7, ∠b = 2x + 3, and ∠c = 6x - 10. if δabc undergoes a dilation by a scale factor of 2 to create δa'b'c' with ∠a' = 5x - 8, ∠b' = 3x - 12, and ∠c' = 7x - 25, which confirms that δabc∼δa'b'c by the aa criterion?
a) ∠a = ∠a' = 47° and ∠b = ∠b' = 23°
b) ∠a = ∠a' = 47° and ∠c = ∠c' = 50°
c) ∠b = ∠b' = 33° and ∠c = ∠c' = 80°
d) ∠b = ∠b' = 23° and ∠c = ∠c' = 45°