C is the reasonable answer.
Cal·o·type
/ˈkaləˌtīp/
an early photographic process in which negatives were made using paper coated with silver iodide.
PROCESS ;
Calotype, also called talbotype, early photographic technique invented by William Henry Fox Talbot of Great Britain in the 1830s. In this technique, a sheet of paper coated with silver chloride was exposed to light in a camera obscura; those areas hit by light became dark in tone, yielding a negative image.
Franz Joseph Haydn
A composer from Vienna, Austria who developed new musical forms such as the sonata and the symphony during the classical period
