Sentence 1: Joshi was a young buddhist monk. 
 Sentence 3: Joshi decided to study buddhism every day and meditate 
 Sentence 4:  He studied and meditated for twenty years 
 Sentence 5:  One day, Joshi finally achieved nirvana 
 Option 1: He had not yet achieved nirvana. 
 Option 2: He had achieved nirvana.