Answer :
Final answer:
The photographer Carleton Watkins typically used 16x20 inches glass plates for his images, which is larger than the other popular sizes of the time.
Explanation:
The photographer Carleton Watkins typically used glass plates for his photographs of a very specific size, reflecting his particular artistic style and the technological capabilities available in his era. Among the choices given, 16x20 inches was the typical size used by Watkins. This size, often called mammoth plate, was larger than the other popular sizes of the time, providing an opportunity for magnificent detail. Watkins utilized these plates to capture his iconic images of the Yosemite Valley and other Western landscapes.
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