Why was modern classification invented?

The correct answer will be- advancement in the technology, techniques and understanding of the biological world.

Explanation:

The organisms are classified according to the taxonomical system of classification which categorized the organisms into a hierarchical system of classification proposed by Carolus Linnaeus in 1735. This system of classification is known as the classical system of classification.

But with advancements in the technology, techniques and understanding of the biological world like the evolutionary concepts which resulted in the understanding of the phylogenetic relationship of the organism.  

Thus, advancement in the technology, techniques and understanding of the biological world is the correct answer.