Parts of a paragraph are given below in jumbled order. Arrange the parts in the correct order to form a meaningful paragraph. The first part 'R.' is fixed.
"R. The knowledge so far
A. Available about the endocrine gland is very limited.
B. Hormones are the body’s chemical messengers.
C. These are the glands that make all the hormones.
D. They influence almost every cell, organ, and function of our bodies."

Correct option is C

Option (c) is the correct order of the given sentences.
Explanation (Structure-wise):
R. introduces the subject: "The knowledge so far..."
A. completes the thought: "Available about the endocrine gland is very limited." → R+A forms the topic sentence.
C. introduces what endocrine glands do: "These are the glands that make all the hormones."
B. defines hormones: "Hormones are the body’s chemical messengers."
D. explains their function: "They influence almost every cell, organ, and function of our bodies."