Whats the agricultural density for china?

Although China's agricultural output is the largest in the world, only about 15% of its total land area can be cultivated. China's arable land, which represents 10% of the total arable land in the world, supports over 20% of the world's population. Of this approximately 1.4 million square kilometers of arable land, only about 1.2% (116,580 square kilometers) permanently supports crops and 525,800 square kilometers are irrigated.[14] The land is divided into approximately 200 million households, with an average land allocation of just 0.65 hectares (1.6 acres). 

The answer to the question is c.