A team needs to create Resource Manager templates for deployment of virtual machines. That would have a custom script extension. 
You need to complete the below resource manager template. 

Answer options:

A.Microsoft.Compute
B.Compute.Extensions
C.CustomScriptExtension
D.PowershellExtension

Answer – C 
An example of this is given in the Microsoft documentation. 

Since this is clearly given, all other options are incorrect. 
For more information on creating templates, please visit the below URL- 

https://docs.microsoft.com/en-us/azure/virtual-machines/windows/template-description