Final answer:
The principle of perception that explains why individuals can read messages with missing letters is the Gestalt principle of closure, which causes our brains to fill in gaps and perceive complete objects.
Step-by-step explanation:
The principle of perception that would BEST explain why you have no trouble reading messages or emails in which letters are missing from words is d. closure. The Gestalt principle of closure states that we tend to fill in gaps to create a complete, whole object. This means that when we read text that has missing letters, our brains automatically fill in the missing information to perceive complete words. Gestalt principles, including closure, play a vital role in our pattern perception and allow us to make educated guesses or perceptual hypotheses about the sensory information we encounter.