The correct answer is: A. temporary issues.

A task force is a temporary group of people who come together to solve a specific problem or achieve a specific goal. They are often used in organizations to address complex or urgent issues that require a cross-functional approach. Task forces are typically disbanded once the problem has been solved or the goal has been achieved.

Option B is incorrect because permanent issues are not typically addressed by task forces. Task forces are designed to be temporary, so they are not well-suited for addressing long-term problems.

Option C is incorrect because complex issues can be difficult to solve, but they are not necessarily permanent. Task forces can be used to address complex issues, but they are not always the best solution.

Option D is incorrect because simpler issues can often be solved by individuals or small groups. Task forces are typically used to address complex or urgent issues that require a cross-functional approach.