According to research cited in your text,what is the best way to respond to an infant's crying?

A) Ignore it, if possible, to avoid spoiling the baby.
B) Let the baby cry for a considerable time before responding.
C) Respond regularly with tender, soothing care.
D) Respond immediately each time the infant cries.

Responding regularly with tender, soothing care to an infant's crying is considered the best approach. This response helps in building a sense of security and trust between the infant and the caregiver, contributing to healthy emotional and psychological development. Ignoring or delaying response can lead to increased stress for the infant and potentially hinder the development of a secure attachment.