Answer:
In order to maintain a smooth functioning between agriculture and industrial sectors, a sound socio-economic infrastructure is necessary. Thus, government is investing huge amount money of for the development of overhead capitals like energy, power, transport, communications, education, health, housing etc.
On ed. the word DANCE is underlined so the answer would be a noun, even though if dance was after a noun, it would be a verb.
D. The blocks were being laid in a circle
Statement of the main idea.