From four years of college can you earn an associate's degree. thus option A is correct.
A community college, junior college, online university, or some four-year institutions in the US all grant associate degrees, which are two-year college degrees. A bachelor's degree and an associate's degree are the two highest levels of education.
A two-year institution (junior college or community college), a four-year college, or a university can grant students an associate degree.
Learn more about an associate degree here:
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