While copying a Data Factory pipeline, you get a "DelimitedTextMoreColumnsThanDefined" error. What might be the possible cause behind this error? (Choose the best possible option)

Answer options:

A.You have reached the capacity limit of integration runtime.
B.The folder you are copying has files with different schemas.
C.Browser cache issue.
D.You have invoked REST API in a Web activity.

Correct Answer: B 
If a folder you are copying consists of the files with different schemas, like different delimiters, quote char settings, variable number of columns, or some data issue, the Data Factory pipeline may return the following error: 

Option A is incorrect. When you reach the capacity limit of the integration runtime, you might be running a huge amount of data flow through the same integration runtime at the same time that makes the pipeline run get fail.
Option B is correct. "DelimitedTextMoreColumnsThanDefined" error is generally returned when the folder you are copying has the files with different schemas.
Option C is incorrect. Browser cache issue might result in a situation where you cancel a pipeline run, but pipeline monitoring often still demonstrates the progress status.
Option D is incorrect. The option does not state the right cause for the given issue.
Reference: 

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