While working with pipelines in Azure Data Factory, you get an issue “Expression builder fails to load”. What might be the possible reason behind it? (Select the option that suits best)

Answer options:

A.Chaining so many activities
B.network or cache issues with the web browser
C.Not implementing time to live feature for Data Flow or optimized SHIR
D.not scaling up SHIR according to your workload
E.Files in a folder with different schema

Correct Answer: B 
The expression builder can fail to load because of network or cache issues with the web browser. This problem can be resolved by upgrading the web browser to the latest updated version of the supported browser, clearing cookies for the site, and refreshing the page.
Option A is incorrect. Chaining so many activities result in error “Code":"BadRequest","message":"ErrorCode=FlowRunSizeLimitExceeded.
Option B is correct. The expression builder can fail to load because of network or cache issues with the web browser.
Option C is incorrect. Not implementing time to live feature for Data Flow or optimized SHIR results in Longer startup times for activities in ADF Copy and Data Flow.
Option D is incorrect. The given is the possible cause of Hitting capacity issues in SHIR.
Option E is incorrect. It is the "DelimitedTextMoreColumnsThanDefined" error which is generally returned when the folder you are copying has filed with different schemas.
Reference:
To know more about troubleshooting pipeline orchestration and triggers in Azure Data Factory, please visit the below-given link: 

https://docs.microsoft.com/en-us/azure/data-factory/pipeline-trigger-troubleshoot-guide