Read the summary.

the chinese discovered how to weave silk from silkworm cocoons, and for centuries they used silk for writing (1). many of the most famous early writings by the chinese were originally inscribed in silk, including the works of the philosopher kitaro nishida, known for his teachings on morality and ethics (2). the teachings of another philosopher, confucius, were also inscribed in silk and became the official philosophy of china (3). lastly, the art of war, written by gautama buddha in ad 100, provided an in-depth analysis of military tactics and is still revered today by many scholars and military leaders (4).

which critiques the factual accuracy of the summary?

a. while parts (1) and (3) are accurate, parts (2) and (4) need revision.
b. while parts (1) and (2) are accurate, parts (3) and (4) need revision.
c. while parts (3) and (4) are accurate, parts (1) and (2) need revision.
d. while parts (2) and (3) are accurate, parts (1) and (4) need revision.