Given below are two statements:
Statement $I:$ If heat is added to a system,its temperature must increase.
Statement $II:$ If positive work is done by a system in a thermodynamic process,its volume must increase.
In the light of the above statements,choose the correct answer from the options given below.

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