Which of the following is a limitation of SQS FIFO queues?

The reason why the choice indicating FIFO queues in SQS offer low throughput compared to standard queues is correct is rooted in the design and functionality of FIFO (First-In-First-Out) queues. SQS FIFO queues are specifically designed to guarantee that messages are processed in the exact order they are sent and to prevent duplicates. To maintain this order and provide the strict, exactly-once processing model, FIFO queues impose certain constraints that inherently limit their throughput capabilities.

Standard queues, in contrast, can achieve a higher throughput because they allow messages to be processed concurrently without strict ordering, which enhances performance when handling a large volume of messages. In environments where message ordering is not a critical requirement, standard queues can efficiently manage a higher rate of message transactions, making them more appropriate for use cases demanding greater throughput.

The constraints on FIFO queues to ensure message ordering and deduplication, such as grouping messages into 'message groups,' do affect their ability to scale as effectively as standard queues. Therefore, it's crucial to choose the right type of queue based on the specific needs of the application, especially when considering the trade-off between message order and processing speed.