Your team is planning on creating a DynamoDB table and use it with their application. 
They are planning to place the initial Read Capacity Unit (RCU) to 10 with the eventual read consistency. You want to read 10 items from the table per second where each item is of size 2 KB.What is the total size of data that can be read per second using the above read throughput capacity?

Answer options:

A.20KB
B.10KB
C.4KB
D.40KB

Answer: D
One read capacity unit represents one strongly consistent read per second, 
or two eventually consistent reads per second, for an item up to 4 KB in size. 
As per the question, for each 2 KB we need 1 RCU. (means 2kb/4kb=1 RCU - rounded to the larger whole number)
So, for 10 RCU we can have up to 20KB per sec.
For eventually consistent read we need to multiply the number of items by `2`, So the size of the item would be 40kB.Below is an example from AWS documentation:
Suppose that you create a provisioned table with 6 read capacity units. With these settings, your application could do the following:
Perform strongly consistent reads of up to 24 KB per second (4 KB × 6 read capacity units).
Perform eventually consistent reads of up to 48 KB per second (twice as much read throughput).
References:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/HowItWorks.ReadWriteCapacityMode.html
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/ProvisionedThroughput.html