Which of the following is a disadvantage of using flowcharts for algorithms?

The correct answer focuses on how flowcharts can become complex and cumbersome as the size and intricacy of the algorithm increase. While flowcharts are a valuable tool for visualizing processes and workflows, they can quickly become difficult to read and follow if there are numerous variables or decision points. This complexity can confuse users or developers trying to understand the algorithm's workflow, particularly in large projects where many flowcharts may need to be integrated.

The other options highlight benefits or characteristics of flowcharts rather than disadvantages. For instance, the assertion that they are always easy to understand overlooks scenarios where complexity diminishes clarity. Similarly, flowcharts can indeed be modified relatively easily if adjustments are needed, supporting an adaptable workflow design. Lastly, while flowcharts outline a sequence of actions, they do not inherently provide a detailed code structure; instead, they offer a high-level overview, which can lead to misunderstandings regarding the specific implementation details required in actual coding.