Susan is following a fad diet she has started to experience low energy during her work out and on a recent trip to the doctor she found out that she has hike restaurant which fat diet is susan most likely following

Susan is mostly on a low-card diet. 
Imagine when you are at dinner, and you fill up on bread before eating. Carbs alike bread and pasta are very filling, and eating a diet without them can lead to cravings and hunger. It is likely that Susan's previous diet was made up of mostly carbs, which would explain why she is so low on energy.
Hope this helps!! 

Ibelieve the answers are a and c.