Three-month-old Andrew was obviously startled by the first ring of the telephone,but with each subsequent ring he seemed to become less reactive.This best illustrates the process of

A) vocal intonation.
B) reflexive responding.
C) epigenetics.
D) habituation.

Habituation

The process of becoming accustomed to a stimulus through repeated exposure, leading to a decrease in response.

Vocal Intonation

The variation of pitch while speaking, which can convey different meanings or emotional states in language.

Reflexive Responding

A type of reaction in which an individual automatically responds to a stimulus without conscious thought.