Various behaviors emerge at different ages. Of the following, which one is demonstrably present in infants less than one week old?

A) ability to recognize their mother's voice
B) ability to use mnemonic devices
C) the concept of object permanence
D) the concept of conservation

Object Permanence

The understanding that objects continue to exist even when they cannot be seen, heard, or otherwise sensed, a concept crucial in cognitive development in infancy.

Conservation

The understanding that some properties of an object or substance remain the same even when its appearance is altered in some way, a concept important in cognitive development.

Mnemonic Devices

Techniques or tools that aid in the memorization and retrieval of information through associations and patterns.