Read the following context and choose the best option to answer the question.
Context: A blood test freaked me out . So when they took what felt like 2 gallons of my blood , I was getting a little bit nervous . So I pushed the doctor until he finally told me what he thought the problem was . He told me that because of the rapid weight loss and growth , that it was most likely an aggressive form of Leukemia .
Question: Why had the narrator rapidly lost weight ?
Options: 
- Because they were suffering from Leukemia .
 - Because they were on a strict diet .
 - Because they were on a juice cleanse .
 - Because they were suffering from Anorexia .


Because they were suffering from Leukemia .