. . . . . . . . a wonderful picture it is!

A. So

B. How

C. Very

D. What

Answer: Option D

Solution(By Examveda Team)

An exclamatory sentence is one that expresses sudden or strong emotions and feelings. It begins with a capital letter and ends with an exclamation mark. 'so', 'how' and 'very' are not used to express strong emotions.
Example: What a mess you've made!
What a handsome man he is!