Jenny intends to take up a job after completing her current activity. Thus, the activity must be something done before getting a job. It can be concluded that the answer must mean 'education' as it is a requirement for a job.
Option A is correct. Studies means education. Jenny can get a job after completing her studies. Thus, it is the best fit for the blank.
Option B is incorrect. Job does not mean education. Thus, it is not the best fit.
Option C is incorrect. Office is a place of work. It does not signify education.
Option D is incorrect. Home does not mean education either. Also, 'finishes her home' does not make sense as a sentence. Thus, home is incorrect.