Which group, following alexander’s death, ruled the indian civilization, and brought wealth and stability to government until the death of its last ruler, ashoka?

The correct answer is:

The Maurya Empire (321-187 BCE).

Under Chandragupta Maurya and his successors, trade, agriculture, and economic activities all prospered over India thanks to the invention of an efficient system of finance, administration, and security. Mauryan India further experienced an era of social peace, religious transformation, and scientific development, until the death of its third and last ruler, Emperor Ashoka the Great.

Maurya Empire (321-187 BCE).  

Explanation:

There was economic prosperity in India after the succession of Chandragupta Maurya in terms of agriculture trade as well as other commercial activities. This is because the invention of the new administration had proposed them. During their era, different counsels advised them, and it was because of this that he had an elaborate administrative structure. Their activities were also maintained by senior officials by regular inspections that saw it grow secretly. Finally, the Maurya developed extensive espionage that raised effectively.

2018 means 2018 ce or common era

there have been other eras too including bce, which included way more years.