GMAT Sentence Correction (SC) | The cottontail rabbit population in Orange County,

Hi,
I have got a few questions here. Request someone to help me on this.

The cottontail rabbit population in Orange County, California, has increased unchecked in recentyears as a result of the removal of the native fox population and the clearing of surroundingwoodlands.

Intended meaning:
1:The cottontail rabbit population in Orange County, California, has increased unchecked in recent years.
2:The increased population is a result of
a) the removal of the native fox population and
b)the
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