the answer is definetely A = Cloud Spanner.

here is the JencoMart scenario:

Oracle Database stores user profiles
20 TB
Complex table structure
Well maintained, clean data
Strong backup strategy

Cloud Datastorage is for Semi-structured application data or non-structure. (https://cloud.google.com/storage-options/)

Robert pointed to https://cloud.google.com/datastore/docs/concepts/overview - "what It's goof for" section second point. And I believe this is misleading and does not fit JencoMart needs. It requires complex table structure.

Why Cloud Spanner (option A) and not Cloud SQL (option B) ?
JencoMart is a Global company and user profiles requires high availability...that's why I would choose Spanner (https://cloud.google.com/spanner/). Can somebody confirm if Cloud SQL is global or regional?

yet a table for comparison - https://cloud.google.com/storage-options/

D - would really be the case - https://cloud.google.com/datastore/docs/concepts/overview

Agree to Robert

Cloud Datastore is ideal for applications that rely on highly available structured data at scale. You can use Cloud Datastore to store and query all of the following types of data:

User profiles that deliver a customized experience based on the user’s past activities and preferences.

Transactions based on ACID properties, for example, transferring funds from one bank account to another.
Product catalogs that provide real-time inventory and product details for a retailer.

The answer is A. The current DB for user profile used by Jenco Mart is Oracle. To use managed services & expand services into Asia as per business requirements CloudSpanner is best choice.
CloudSQL will be used for their PostgresSQL DB to stores user credentials.

Though Cloud Datastore is considered as No-SQL, Best option to store the user profiles could be Datastore.

Though CloudSQL Can also be used, Best to use Datastore as long as we don‘t have to set the relationships between the tables.

I go with the answer D

Answer A: Cloud Spanner.

Cloud SQL use cases: user credentials, customer orders
so - B

I think answer should be D because in Question 22 "JencoMart has decided to migrate user profile storage to Google Cloud Datastore and the application servers to Google Compute Engine (GCE)...."

Answer D.
It's a web based solution. They need seamless scaling, etc.
https://cloud.google.com/datastore/docs/concepts/overview - see the "what It's goof for" section second point.

Answer A.
Cloud Datastore is for NOSQL only.
Spanner is a SQL like db