Final answer:
To enhance a landing page experience, optimizing for mobile devices is crucial. Increasing load times, adding irrelevant content, or using pop-up ads negatively impact user engagement and should be avoided.
Step-by-step explanation:
To improve your landing page experience, you may want to optimize for mobile devices. This involves making sure your landing page is responsive and adjusts well to different screen sizes, loading effectively on tablets and smartphones. Optimizing for mobile devices is essential as a significant amount of web traffic comes from mobile users. Therefore, choice (d) is the correct answer. Increasing page load time, adding irrelevant content, and using pop-up ads are generally detrimental to user experience and can result in higher bounce rates and lower engagement.