The particular routes and timings of the voyages depicted on the maps best reflect which of the following characteristics of Omani merchants?
A: Their Islamic ritual observances, which made travel difficult during the fasting period of Ramadan
B: Their advanced knowledge of Indian Ocean currents and monsoon wind patterns
C: Their need to avoid the routes traveled by the faster and better-armed Portuguese trading ships
D: Their control of the sources of grain needed by Chinese and East African cities
Their advanced knowledge of Indian Ocean currents and monsoon wind patterns