Which of the following refers to techniques that allow for efficient problem-solving in integration?

The correct answer focuses on the various approaches that can be employed to solve integration problems more efficiently. These techniques include methods such as substitution, integration by parts, and partial fraction decomposition. Each of these techniques enables the solver to simplify complex integrals into more manageable forms, thereby making the overall process faster and more intuitive.

While other options might offer valuable mathematical principles or concepts, they do not specifically encompass the broad range of methods explicitly designed for enhancing problem-solving efficiency in integration. For example, the Fundamental Theorem of Calculus is integral to linking differentiation and integration but does not provide specific techniques for solving integrals. Similarly, integration techniques are a general category that might not encompass the particular strategies referred to in the answer.

In summary, the answer appropriately identifies the collection of practical strategies and shortcuts that facilitate quicker and more effective integration problem-solving.