Question:
Which team did Jonas Hofmann play for in Sep, 2013?

Context:
 Jonas Hofmann plays for Germany national under-21 football team from Jan, 2013 to Jan, 2014. 
 Jonas Hofmann plays for Borussia Mönchengladbach from Jan, 2016 to Dec, 2022. 
 Jonas Hofmann plays for Germany national under-18 football team from Jan, 2009 to Jan, 2010. 
 Jonas Hofmann plays for 1. FSV Mainz 05 from Jan, 2014 to Jan, 2015. 
 Jonas Hofmann plays for TSG 1899 Hoffenheim from Jan, 2011 to Jan, 2011. 
 Jonas Hofmann plays for Borussia Dortmund II from Jan, 2011 to Jan, 2014. 
 Jonas Hofmann plays for Borussia Dortmund from Jan, 2012 to Jan, 2016.

Answer:
Borussia Dortmund II