Question

how does michio kaku develop the idea of how the internet will evolve in \the intelligent planet\?
by describing the companies that dominate the internet
by presenting a metaphor of a dirt road being paved
by comparing the growth of other scientific fields

Explanation:

In Michio Kaku's "The Intelligent Planet", he uses the extended metaphor of a dirt road being paved to trace the evolution of the internet: starting as a basic, limited "dirt road" (early, small-scale internet) and developing into a smooth, widespread, advanced "paved road" (the intelligent, integrated future internet). The other options do not match his core method of developing this idea.

Answer:

by presenting a metaphor of a dirt road being paved