Topic: Fill in the Blank,

Best Answer Explained in Below-:

The phrase "It comes as no surprise that societies have codes of behavior" introduces the idea that social norms and rules are a common feature across cultures. However, the subsequent clause suggests there can be variation in the nature of these codes. The word "unexpected" aligns well with this concept, indicating that while the existence of behavior codes is commonplace, their specific characteristics can vary widely and may not conform to assumptions or stereotypes.

Choosing "B) unexpected" underscores the idea that these codes can reflect unique, sometimes surprising cultural values, beliefs, and practices that might defy conventional wisdom or general assumptions about how societies regulate behavior. For example, behaviors considered acceptable in one culture may be viewed as taboo in another, highlighting the diversity of human social practice.

In contrast, options like "A) predictable," "C) admirable," and "D) explicit" suggest a level of consistency or expected quality that contradicts the essence of cultural specificity and variability. Thus, "unexpected" captures the element of surprise in how different societies articulate and enforce their codes of behavior, making it the most fitting choice.