Given below are two statements:
Statement-$I$: High concentration of strong nucleophilic reagent with secondary alkyl halides which do not have bulky substituents will follow $S_{N}2$ mechanism.
Statement-$II$: $A$ secondary alkyl halide when treated with a large excess of ethanol follows $S_{N}1$ mechanism.
In the light of the above statements,choose the most appropriate from the options given below:

• A
  Statement-$I$ is true but Statement-$II$ is false.
• B
  Statement-$I$ is false but Statement-$II$ is true.
• C
  Both Statement-$I$ and Statement-$II$ are false.
• D
  Both Statement-$I$ and Statement-$II$ are true.