As the Talent Acquisition manager at Sentil Bank, you've noticed a concerning trend: many candidates start the application process on your company's website, but many still need to complete it. Suspecting that this may be due to the website's mobile user experience, you've made enhancements to make the site more mobile-friendly. You now want to assess if these changes have effectively addressed the issue of candidates abandoning their applications. Which metric should you primarily monitor to evaluate the effectiveness of the changes made to the website? a. total number of applications received, b. time to stage, c. application abandonment rate, or d. application time