यदि $f$ और $g$ अवकलनीय फलन इस प्रकार हैं कि $g'(a) = 2$ और $g(a) = b$,और यदि $f \circ g$ एक तत्समक फलन (identity function) है,तो $f'(b)$ का मान किसके बराबर है?

  • A
    $2/3$
  • B
    $1$
  • C
    $0$
  • D
    $1/2$

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