What burden influenced some non muslims to convert to islam

B)They had to pay a special tax.  

the tax was called "Jizya"

- "it was a failure that was an embarrassment for the kennedy administration."

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the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.