The absolute configuration of the compound is:

(2S , 3R)

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(2S , 3S)

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(2R , 3R)

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(2R , 3S)

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Solution

The correct option is A (2S , 3R)

Numbering will start from atom which has highest atomic number
$2$ carbon configuration is $2 S$ .
refer to image 01
$3$ carbon configuration is $3 R$
refer to image 02
So,(2S,3R) is absolute configuration .

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A

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{1}

B

1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{4}

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1 s^{2} 2 s^{2} 2 p^{5} 3 s^{1}

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