Which of the following is NOT considered a best practice for opt-in forms to improve conversions?

• A. Asking for only essential information.
• B. Including consent language and inline validation.
• C. Optimizing for mobile.
• D. Requiring full address and phone number.

Answer: (D)

The main concept is reducing friction in opt-in forms to boost conversions. Best practices include asking only for essential information, providing clear consent language so users know what they’re signing up for, and offering inline validation to catch mistakes as they type, plus ensuring the form works well on mobile. Requiring a full address and phone number goes against this idea because it adds unnecessary steps and data collection, which tends to deter sign-ups and lower conversion rates. The other practices help streamline the process, improve clarity, and keep the form user-friendly across devices. So this option is not considered a best practice.