Please use the following link to view the journal article in order to answer the following question:

https://doi.org/10.1556/2006.4.2015.010

(PLEASE MAKE SURE YOU VIEWING THE CORRECT ARTICLE BEFORE ANSWERING CALLED:

Relationship of smartphone use severity with sleep quality, depression, and anxiety in university students BY KAD?R DEM?RC?*, MEHMET AKGNL and ABDULLAH AKPINAR)

Question:

Which of the following study characteristics contribute to decreased external validity in this study: :1 There are males and females :] There are depressed and non depressed people :] All of the participants were college students :] Race/ethnicity was not assessed D All of the participants were from a similar geographic area