Given below are two statements:
Statement-$I$: Along the period,the chemical reactivity of the elements gradually increases from group $1$ to group $18$.
Statement-$II$: The nature of oxides formed by group $1$ elements is basic,while that of group $17$ elements is acidic.
In the light of the above statements,choose the most appropriate answer from the options given below:

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