Which one of these is not a literary journal/magazine?

The correct option is The Hundred and One Dalmatians.

To understand why this is the correct answer, we can examine the nature of each option:
1. The Hundred and One Dalmatians is a classic 1956 children's novel written by the English author Dodie Smith. Since it is a standalone work of fiction (a novel) rather than a periodic publication, it is not a literary journal or magazine.

In contrast, the other options are highly significant historical literary journals and magazines:
2. The Egoist was an influential British literary magazine published from 1914 to 1919. It played an essential role in the development of modernism, famously publishing serialized work by James Joyce (including A Portrait of the Artist as a Young Man) and poetry by Ezra Pound and T. S. Eliot.
3. The Criterion was a major literary magazine founded and edited by T. S. Eliot, which ran from 1922 to 1939. It is particularly famous for publishing Eliot's masterpiece poem, The Waste Land, in its very first issue.
4. The English Review was a monthly literary journal published from 1908 to 1937. Founded by Ford Madox Ford, it published works by legendary writers like Thomas Hardy, Joseph Conrad, D. H. Lawrence, and Henry James.