What are conditionals in Python used for?

Conditionals in Python are primarily utilized to make decisions within programs. They enable the execution of specific blocks of code based on whether particular boolean conditions evaluate to true or false. For instance, with statements like if, elif, and else, a program can alter its flow of execution based on various scenarios. This capability is crucial for creating dynamic and responsive applications that can react to different inputs and conditions, making them more versatile.

While other concepts in programming, such as loops, error handling, and function definitions, are essential, they serve different purposes. Loops allow for repeated execution of code, error handling manages exceptions and unexpected situations, and defining functions organizes and encapsulates repetitive tasks. None of these functionalities relate directly to the decision-making aspect that conditionals provide. Thus, choice B accurately describes the role of conditionals in Python programming.