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The instantaneous rate for reaction $2 A+B \rightarrow C+3 D$, is given by

• ✓
  $\frac{1}{3} \frac{ d [ D ]}{ dt }$
• B
  $\frac{ d [ B ]}{ dt }$
• C
  $\frac{ d [ A ]}{ dt }$
• D
  $\frac{1}{2} \frac{ d [ A ]}{ dt }$