Given below are the two statements.
Statement $I$: In prokaryotes,there is only one replicon,however,in eukaryotes,there are several replicons in tandem.
Statement $II$: The two separated strands in a replicon of $DNA$ are prevented from rejoining by helicase enzyme.
In the light of the above statements,choose the correct answer from the options given below.

• A
  Statement $I$ is incorrect but Statement $II$ is correct.
• B
  Statement $I$ is correct but Statement $II$ is incorrect.
• C
  Both statement $I$ and statement $II$ are correct.
• D
  Both statement $I$ and statement $II$ are incorrect.