The answer is C ms-dos
Side note:
GUI means graphical user interface. In other words, that means it looks pretty and has cool buttons, animations and cute stuff. MS-DOS is just a black screen with words on it. Definitely not cute or cool.
Answer:
I think the answer is formulas
It would be a audio file -B.
Answer:
INPUT
Explanation:
EXAMPLE PYTHON CODE
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INPUT CODE:
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foo = input('foo: ')#Have some text printed before the input field
bar = foo
print(bar)
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OUTPUT CODE:
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foo: Hello World!
Hello World!
>>> bar
'Hello World!'
>>>foo
'Hello World!'