Rearrange the given parts to form a meaningful sentence:-

(A) practical demonstration clarified their doubts
(B) in great detail, the students struggled to grasp
(C) although the professor explained the complex theories
(D) the underlying concepts until the

Choose the correct answer from the options given below:-

(C), (B), (D), (A)

The correct answer is Option (4) → (C), (B), (D), (A)

(C) although the professor explained the complex theories
(B) in great detail, the students struggled to grasp
(D) the underlying concepts until the
(A) practical demonstration clarified their doubts

Complete Sentence: Although the professor explained the complex theories in great detail, the students struggled to grasp the underlying concepts until the practical demonstration clarified their doubts