Final answer:
Clusters in file management increase the number of blocks to manage and increase the amount of fragmentation.
Step-by-step explanation:
The consequences of using clusters in file management include increasing the number of blocks to manage and increasing the amount of fragmentation. Clusters are groups of sectors used for file storage. When a file is stored in multiple clusters, it leads to an increase in the number of blocks needed to manage the file, which can make the file system more complex.
Additionally, using clusters can also increase the amount of fragmentation. Fragmentation occurs when files are not stored in contiguous blocks, leading to wasted disk space. With clusters, if a file does not fit into a single cluster, it is divided into multiple clusters, resulting in internal fragmentation.
Therefore, option a. They increase the number of blocks to manage and increase the amount of fragmentation is the correct choice.