It is a good idea to prepare for possible layoffs by making sure
a. your cubicle is clean
b. your boss likes you a lot
c. your résumé is up to date
d. your vacation is planned

The correct answer is option c) " your résumé is up to date".

If you work as an employee in a company, it is better to be prepared in case the company starts dismissing people.

One way of getting ready for this is to keep your résumé up to date so that you can start looking for a job immediatly.

The rest of the option do no apply since the company that decides the layoffs will not be interested in your planned vacations, your cubicle or your relationship with the boss.

c.  your résumé is up to date

In the job world, a “layoff” means the act of dismissing an employee.  This is not the same as being fired because being fired indicates subpar performance in some regard. A layoff can happen simply if a company is looking to save money regardless of employee performance or even if a project you happen to be working on is ending or being eliminated through no fault of your own.  What it means to be prepared for a layoff is to be ready to be looking for another job to replace the one you are potentially about to lose.   When one is looking for a job, one does so with a résumé, which is a current list of previous jobs held, education level, skills, and qualifications.  Thus, to prepare for possible layoffs, one would most certainly want to make sure his or her résumé is up to date.

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