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After some more googling, I found the following:
Aurora multi-master is regional. So, the answer A is ruled out.As to D (using DynamoDB for OLTP), I found one reference:
In the link: https://aws.amazon.com/blogs/database/how-to-determine-if-amazon-dynamodb-is-appropriate-for-your-needs-and-then-plan-your-migration/, it says that:
Are working with an online transaction processing (OLTP) workload. High-performance reads and writes are easy to manage with DynamoDB, and you can expect performance that is effectively constant across widely varying loads.
But, I really can’t find any information, which explains how DynamoDB can be used for a Sales and Financial Transaction processing.
