Which of the following represents a cultural prescriptive belief during pregnancy?

The belief that one should remain active during pregnancy is a cultural prescriptive belief because it emphasizes the importance of staying physically engaged and promotes healthy behaviors. Many cultures advocate for active participation in daily life as a means to ensure both maternal and fetal health. This belief can stem from the understanding that moderate exercise can lead to better outcomes during pregnancy, such as improved mood, reduced discomfort, and possibly easier labor. Therefore, remaining active aligns with cultural beliefs about health and wellness during pregnancy.

In contrast, the other options reflect specific beliefs that may vary widely across different cultures. For example, the idea that coldness should be avoided can be rooted in certain cultural understandings of health that associate cold with illness. The belief about not having pictures taken could stem from superstition or cultural practices regarding the spirit. Lastly, avoiding sexual intercourse during the third trimester might relate to safety concerns or traditional practices, but it's not universally accepted as a cultural prescriptive belief. Each of these reflects cultural nuances, but the emphasis on remaining active stands out as a generally positive and proactive expectation tied to maternal health.