Final answer:
The Ishihara chart is the best option to test for colorblindness in a child who reports difficulty in seeing certain colors. This test uses patterns of colored dots to assess an individual's ability to perceive colors correctly.
Step-by-step explanation:
To determine if a child is colorblind, the most appropriate test is the Ishihara chart. This test evaluates color perception by presenting a series of plates with numbers composed of dots in various colors and sizes. The individual being tested must identify the numbers within the dots. If they are unable to correctly perceive the numbers, it may indicate color vision deficiency, commonly known as colorblindness.
The other tests mentioned serve different purposes: the Snellen test measures visual acuity; the Tumbling E chart is used for people who cannot read or who have difficulty with letters; and the Weber test is actually not for vision but is an audiological test to assess hearing.
Given the context of a 10-year-old patient who reportedly cannot see certain colors, the nurse practitioner would use the Ishihara chart (option c). It is well-suited for detecting red-green color deficiencies, which, although more common in males, can still occur in females.