Given below are two statements: One is labelled as Assertion $A$ and the other is labelled as Reason $R$:
Assertion $A:$ $ATP$ is used at two steps in glycolysis.
Reason $R:$ First $ATP$ is used in converting glucose into glucose-$6$-phosphate and second $ATP$ is used in conversion of fructose-$6$-phosphate into fructose-$1,6$-bisphosphate.
In the light of the above statements,choose the correct answer from the options given below:

• A
  $A$ is false but $R$ is true.
• B
  Both $A$ and $R$ are true and $R$ is the correct explanation of $A$.
• C
  Both $A$ and $R$ are true but $R$ is $NOT$ the correct explanation of $A$.
• D
  $A$ is true but $R$ is false.