Final answer:
The correct standard form of the given expression three + 50 + (2 x 1/10) + six thousandths is 53.206, which does not match any of the provided options A, B, C, or D.
Step-by-step explanation:
To write the number in standard form, we add up the various components: three, fifty, two tenths, and six thousandths.
Therefore, the number written in standard form is:
3 (three) + 50 (fifty) + 0.2 (2 x 1/10) + 0.006 (six thousandths) = 53.206
However, it appears there might be a typo in the options provided. The correct answer isn't listed, so we'll assume that the expected correct answer would be 53.206, not matching the provided options A, B, C, or D.