You are invoking a workflow file called "SecondaryWorkflow.

In the given scenario, the "SecondaryWorkflow.xaml" is invoked from "PrimaryWorkflow.xaml" with an argument "in_Message". The Import Arguments panel of the Invoke Workflow File activity in "PrimaryWorkflow.xaml" is showing that the value "Invoked from the first file" is passed to "SecondaryWorkflow.xaml". Since the "SecondaryWorkflow.xaml" has an argument "in_Message" with the default value "This is the second file", this default value is overridden by the value provided during the invoke action. Therefore, when the Log Message activity in "SecondaryWorkflow.xaml" is executed, it will log "Invoked from the first file", making option B correct.