Which of the following is a hallmark of psychological thrillers?

Psychological thrillers are characterized by their focus on the internal conflicts and complex motivations of the characters, often exploring themes such as fear, anxiety, and the darker sides of human nature. Intense character development is essential in this genre, as it allows the audience to connect with the protagonists and antagonists on a deeper level, heightening the sense of suspense and uncertainty.

In psychological thrillers, the narrative often unfolds in such a way that the psychological state of the characters plays a crucial role in driving the plot forward. This creates an atmosphere of tension and unpredictability, as viewers become invested in the characters' journeys and struggles. The blend of character depth and suspense is what distinguishes psychological thrillers from other genres, such as action or adventure films, where visual effects or predictable plots might take precedence.

The other options do not encapsulate the essence of psychological thrillers in the same way. For example, an emphasis on visual effects is more typical of action or science fiction films, while predictable storylines are found in genres that rely on formulaic plots. Lighthearted comedy elements are generally not compatible with the serious and often darker tone present in psychological thrillers. Hence, the hallmark of intense character development and suspense is what truly defines this genre.