Upto where did Chandragupta Maurya's empire extend in the north west?

Answer: Option D

According to the Buddhist text Mahavamsa tika, Chandragupta and his guru Chanakya began recruiting an army after he completed his studies at Taxila (now in Pakistan). This was a period of wars, given that Alexander the Great had invaded the northwest subcontinent from Caucasus Indicus (also called Paropamisadae in ancient texts, now called the Hindu Kush mountain range).