Find the smallest fraction which when added to $\frac{2}{5} \times \frac{15}{21} \times \frac{7}{10} \times \frac{3}{8}$ gives a whole number.

  • A
    $\frac{23}{40}$
  • B
    $\frac{35}{40}$
  • C
    $\frac{37}{40}$
  • D
    $\frac{31}{40}$

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