Answer:
A. Subitizing
Explanation:
The skill to recognize small numbers of objects without counting is known as subitizing.
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Additional comment
Some people are able to quickly recognize numbers as large as 8. More commonly in humans, the limit is about 6.
Most animals (and some insects) have an inborn ability to recognize and count up to 3. After that, the group size gets generalized to "many." Predators that hunt in groups take advantage of this limitation in their prey.