(B) In the $C_3$ cycle (Calvin cycle),the regeneration phase involves the conversion of triose phosphates back into $RuBP$.For the regeneration of $1$

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(B) In the $C_3$ cycle (Calvin cycle),the regeneration phase involves the conversion of triose phosphates back into $RuBP$.For the regeneration of $1$ molecule of $RuBP$,$1$ molecule of $ATP$ is consumed.Therefore,for the regeneration of $4$ molecules of $RuBP$,the expenditure required is $4 \times 1 = 4$ molecules of $ATP$.