Option 1: monarch -> A monarch is a sovereign ruler (king/queen), not someone who represents others at a conference.
Option 2: delegate -> A delegate is a person authorized to represent others at a meeting or conference.
Option 3: martyr -> A martyr is someone who suffers or dies for a cause, unrelated to conference attendance.
Option 4: conjurer -> A conjurer is a magician or performer of tricks, not relevant in this professional context.
Hence, Option 2: delegate -> A delegate is the appropriate term for someone who is sent to represent a group or organization at a conference or meeting. The sentence indicates Ashok is representing "us" at the conference, making "delegate" the most suitable word -> correct