Final answer:
The innate tendency for human infants among the given options is b. rooting and sucking. These reflex behaviors are automatic and essential for survival, unlike learned behaviors such as potty training or language acquisition.
Step-by-step explanation:
Among the choices provided, the innate tendency that can be considered for human infants is rooting and sucking. This is an innate behavior that is essential for a newborn's survival. Infants demonstrate the rooting reflex, which helps them find the nipple, and the sucking reflex, which enables them to extract milk. These reflex behaviors are automatic and do not require learning, which contrasts with learned behaviors like being potty trained or learning a language. An example of this innate behavior is when an infant turns its head towards anything that strokes its cheek or provides a touch similar to that of a nipple.