Arrange the following events chronologically as they occur during embryonic development. 

(A) Appearance of heart sounds
(B) Development of limbs and digits
(C) Formation of three primary germ layers
(D) Separation of eyelids

Choose the correct answer from the options given below:

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

The correct answer is Option (2) → (C), (A), (B), (D)