In the mauryan period especially under Ashoka, architecture saw a great advancement.
The mauryan empire was the first in India to transition from wood to stone in their architecture and art.
It depicted the influence of Persians and greeks.
It marked the beginning of construction of free standing hindu temples.
The stupas of Sanchi and Sarnath are great symbols of their achievement.
The development of Cave architecture was done by them.
Building of rock cut temples were also one of the greatest achievements of the mauryan empire. Hence the statement is justified.