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The sum of the series `a-(a+d)+(a+2d)-(a+3d)+` up to `(2n+1)` terms is `-n d` b. `a+2n d` c. `a+n d` d. `2n d`

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The sum of the series `a-(a+d)+(a+2d)-(a+3d)+` up to `(2n+1)` terms is `-n d` b. `a+2n d` c. `a+n d` d. `2n d`
A. `-nd`
B. a+2nd
C. a+nd
D. 2nd
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Correct Answer - C
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