MIDI is a A. technology based on placing brief digital recordings of live sounds under the control of a synthesizer keyboard. B. technology based on representing data in terms of measurable physical quantities. C. standard adopted by manufacturers for interfacing synthesizer equipment. D. technology based on representing physical quantities as numbers

The answer is "Option C".

Explanation:

MIDI is a way of collecting and playing music on wireless acoustic instruments. It's a multitasking software system sponsored by various home computer manufacturers. Initially designed to handle one mouse, it was used for Mac easily, and other choices are not correct, which can be described as follows:

In option A, It is not used to control keyboard, that's why it is wrong. In option B, It doesn't represent data, that's why it is incorrect. In option D, It isn't used to represent physical quantity, that's why it is wrong.