Albert thinks he may be subject to alternative minimum tax this year because he sold his business for a capital gain of $420,000 and he claimed a capital gains deduction of $200,000. When completing his regular T1 return, Albert found that his taxable income was $320,000. What is Albert's adjusted taxable income on his alternative minimum tax return? a) $370,000 b) $446,000 c) $520,000 d) $586,667