Final answer:
Whisker Jones is not a character in Dylan Thomas's play Under Milk Wood, whereas Willie Nilly, Organ Morgan, and May Day are part of the cast. So, the correct answer is D. Whisker Jones.
Step-by-step explanation:
The character Whisker Jones is not a part of the play Under Milk Wood by Dylan Thomas.
The characters Willie Nilly, Organ Morgan, and May Day do appear in the work.
Under Milk Wood is a radio drama by Welsh poet Dylan Thomas, first performed in 1954.
The play is set in the fictional Welsh village of Llareggub and explores the dreams and innermost thoughts of its inhabitants through a 24-hour period.
Willie Nilly is the postman, Organ Morgan is the church organist, and May Day is mentioned in the play as part of the eclectic cast of characters sprung from Thomas's vivid imagination.
The inclusion of the name Whisker Jones among the options aims to test familiarity with Thomas's work, as it is not a character from Under Milk Wood.
Thus, the correct answer is D. Whisker Jones.