A company wants to purchase an Azure support plan. Which of the following is the most cost-effective plan that has the following embedded into the plan? Access to the full set of Azure Advisor Recommendations.
Business hours access to support engineers via email.
 

Answer options:

A.Basic
B.Developer
C.Standard
D.Professional Direct
E.Premier

Answer - B 
The most cost-effective plan with these points is the Developer plan. 
The Microsoft documentation mentions the following. 

Since this is clear from the documentation, all other options are incorrect. 
For more information on support plans, please visit the below URL- 

https://azure.microsoft.com/en-us/support/plans/