How does unemployment effect the PPC in regards to this figure

Macmillan Le x Q chapter 6 BI x A WiFi Mouse( X Q UCLA Econ 1 X Cengage Dig x UCLA Microsoft W X UCLA Microsoft W X M SchoolsFirst X M Deadline to | x 20F-LIFESCI X C moodle2.sscnet.ucla.edu/pluginfile.php/765552/mod_resource/content/1/Midterm1_V1_Fall2015.pdf S G To # 10. Consider the figures below. Panel (a) Panel (b) cups of coffee 7 - Temps of coffee 7 - 65-- 65 6 55 55+.. 45 35 35 w w 25 25 N 15 15 donuts donuts Refer to Panel (a) and Panel (b). A shift of the economy's production possibilities frontier from Panel (a) to Panel (b) could be caused by a) unemployment b) an improvement in donut production technology. c) an improvement in coffee production technology. d) an improvement in both donut and coffee production technology