(a) Robin is experiencing targeted ads due to adware, which collects information about his online activities. Since he searched for wrist watches and sports items, the adware uses this data to display related advertisements.
(b) To avoid this, Robin should use ad blockers, browse in private mode, and be cautious about installing software from untrusted sources.
(c) To get rid of the adware, he should run anti-adware scans using reputable tools, uninstall any suspicious programs, reset his browser settings, and ensure his security software is up-to-date. These steps will help remove the adware and prevent further unwanted advertisements.