Who among the following described drama in the following words?
“A true play is three dimensional; it is literature that walks and talks before our eyes.”

The correct option is Marjorie Boulton.

Detailed Explanation:
The definition of a play or drama as something "three-dimensional" is a well-known concept in literary studies, formulated by the British writer and poet Marjorie Boulton in her influential work, The Anatomy of Drama (first published in 1960).
In this book, Boulton seeks to distinguish drama from other literary forms, such as novels and poetry.

Boulton explains that while a novel or a poem is primarily "two-dimensional" because it exists as words printed on a flat page to be read silently, a play is designed for live performance.
When a play is staged, it gains a physical dimension (the space of the stage), a visual dimension (actors walking, moving, and using gestures), and an auditory dimension (actors talking and speaking the lines). Therefore, she writes that "A true play is three-dimensional; it is literature that walks and talks before our eyes."

Thus, the quote highlights the active, performative, and multidimensional nature of theatrical literature, separating it from purely text-based literary genres.