Answer:
a. While parts (1) and (3) are accurate, parts (2) and (4) need revision.
Step-by-step explanation:
Sentence 1 tells us that the Chinese discovered silk, and that they used it for writing. This is an accurate statement. Sentence 3 tells us that Confucius wrote on silk and that his writings were considered the official philosophy of China. This is similarly accurate.
Sentence 2 is wrong because Kitaro Nishida is a Japanese, not a Chinese philosopher. Moreover, he belongs to the 19th and 20th century, which means he most likely did not write on silk, but on paper. Sentence 4 is wrong because The Art of War was not written by Gautama Buddha in 100 AD, but by Sun Tzu during the 5th century BC.