Research on body shape and standards of beauty indicates that ____.

A) in general, the inverted triangle shape is seen as most attractive in men and women
B) across cultures, the standards of beauty are nearly identical
C) within cultures, the standards of beauty across time are very stable
D) in general, the hourglass shape is seen as most attractive in both men and women

The hourglass shape is often cited in research as being perceived as attractive for women due to its association with fertility and health. For men, while the preference might vary, the "V" shape or inverted triangle (broad shoulders, narrow waist) is often seen as attractive, but the statement specifically mentioning both genders and the hourglass shape makes D the correct choice. Choices A, B, and C are incorrect because they either misrepresent the attractiveness of body shapes across genders or overstate the uniformity and stability of beauty standards across cultures and time.