In synonym questions often you could see all the four options appearing to fit the blank perfectly well. From among the options you have to careful enough to choose the best fit.
___ of Indian painters and musicians who lived during medieval period is to be wondered about and appreciated.
Answer : a. Artistry
Artistry refers to work in the field of art. Though option b Works fits the blank, it may not as good choice as Artistry. Sculptures and Innovation do not fit the blank either. Hence option a is the right answer.
In an effort to control noise pollution, Traffic department of New York decided to do scrap ___ vehicles.
Answer : b. clunky
Clunky means noisy. Since the context of the sentence is about noisy vehicles that need to be scrapped, option a is the best fit.
One of the major reasons for stability of Indian government is the pro democratic _____ that exists in all sections of society.
Answer : c. collectivism
Collectivism refers to support and doing things/carrying out initiatives collectively. In this particular question, almost all the options seem to fit the blank. But collectivism is the best of all. Other words fit the blank but not as powerful and direct as that of option c.