Final answer:
The décolleté is the lower neck and chest area of a woman's torso, often emphasized in fashion.
Step-by-step explanation:
The décolleté refers to the upper part of a woman's torso, comprising the lower neck and chest. It is an area often highlighted in fashion by low-cut necklines and elegant attire. Therefore, when asked where the décolleté is, the correct answer is D. Lower neck and chest.