In FCFS, the request which comes first is served first.
Given cylinder Queue: $10, 22, 20, 2, 40, 6, 38$
Head Movements:$(20-10)+(22-10)+(22-2)+(40-2)+(40-6)+(38-6)=146$
Seek Time= $6ms$/cylinder
For $146$ seeks, seek time= $6*146=876ms$
Option d) is the correct answer