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C is corrent. The American Opportunity credit provides for a maximum credit of $2,500 per year (100% of the first $2,000, plus 25% of the next $2,000 of tuition expenses) for the first four years of postsecondary education. The credit is available on a per student basis and covers tuition for the taxpayer, spouse, and dependents. To be eligible, the student must be enrolled on at least a half-time basis for one academic period during the year. The American Opportuinity credit is available for an individual only if the lifetime learning credit is not claimed for that individual during the same tax year.
A is incorrect because the credit is available for four years of postsecondary education. 
A is incorrect because the credit is available for four years of postsecondary education. 
D is incorrect because the credit is available for four years of postsecondary education.