Answer:
The invention of Gutenberg's movable metal type ( A )
Step-by-step explanation:
The invention of Gutenberg's movable metal type of printing press in Europe was made in 1450 by Johannes Gutenberg in response to the necessity of printing the small number of alphabetic characters for European languages as at that time.
The Movable metal printing press was used to print many type face like the Woodblock printing, solid ink printing. these type were casted/printed based on the innovation of a matrix system as well as hand moulding that complemented the movable metal type.