UMMMMM b is the best answer i see there but that is a really poorly explained question
Answer:
C.
Explanation:
Using more wood= Deforestation and other environmental problems
The Long March most commonly refers to the transfer of the main group of the First (or Central) Red Army, which included the leaders of the Communist Party of China, from Yudu in the province of Jiangxi to Yan'an in Shaanxi. In this sense, the Long March lasted from October 16, 1934, to October 19, 1935.

Indian classical music is the classical music of the Indian subcontinent, this includes India, Pakistan, Bangladesh, Sri Lanka and Nepal.It has two major traditions: the North Indian classical music tradition is called Hindustani, while the South Indian and Sri Lankan expression is called Carnatic. These traditions were not distinct until about the 16th century. During the period of Mughal rule of the Indian subcontinent, the traditions separated and evolved into distinct forms. Hindustani music emphasizes improvisation and exploring all aspects of a raga, while Carnatic performances tend to be short and composition-based. However, the two systems continue to have more common features than differences.

Because they are full of water and the sand should be firm enough to carry the camel.