Which groundbreaking innovation did Penguin Books introduce in 1935 that revolutionized the publishing industry and made quality literature more accessible to the general public?

In the world of publishing, certain brands have transformed how we access and appreciate literature. One such revolutionary brand made decisions that democratized reading for the masses. Test your knowledge of this iconic publisher's history and its impact on making quality literature accessible to everyone regardless of economic status. This trivia explores how innovative product design and marketing strategies in publishing changed the literary landscape forever.

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Affordable paperbacks with standardized cover designs sold at the price of a pack of cigarettes
The first subscription-based book club with monthly deliveries
The first illustrated classics collection with color plates
The first bookstore chain with locations in train stations