Considering the situation of Alexander, the maximum amount he can contribute to a traditional IRA for 2020 is "$6,000" annually.
This is because, according to Internal Revenue Service (IRS), the annual contribution limit for 2019, 2020, 2021, and 2022 is $6,000.
However, for individuals 50 years and above, the annual contribution limit is $7,000.
Given that Alexander is only 43 years, therefore, the maximum amount he can contribute to a traditional IRA for 2020 is "$6,000" annually.
Hence, in this case, it is concluded that the correct answer is "$6,000."
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