Answer: Therefore, the correct answer is: Waves are seen to approach the beach at an angle.
Step-by-step explanation:
An observation in science refers to a direct and factual statement based on the information gathered through the senses or measurements. Among the given options, the following statement would be considered an observation:
"Waves are seen to approach the beach at an angle."
This statement describes something that can be directly perceived or measured by observing the behavior of waves as they move towards the beach. It is a factual and observable phenomenon that can be witnessed and documented.
On the other hand, the remaining options involve explanations or concepts rather than direct observations. They provide information about the causes, effects, or mechanisms behind waves, but they do not describe something that can be directly observed or measured. These options involve interpretations, explanations, or generalizations based on scientific knowledge, rather than direct sensory or measurable data.