What is a disadvantage of using a multimedia presentation?
a: (it does not allow audience interaction.)
b: (it requires special hardware, such as a computer and speakers.)
c: (viewers have no control over the sequence of the presentation.)
d: (it cannot reach a large audience.)

Let's look at all the options:

A:(It does not allow audience interaction.)ion
This is false. The speaker has a complete control over when to stop the presentation, so if the audience has some question, the speaker can stop the presentation

B:(It requires special hardware, such as a computer and speakers.)
This is the correct answer! Setting up the hardware and software often takes a long time and delays the start of the presentation

C:(Viewers have no control over the sequence of the presentation.)
This might be true, but viewers have no control over any presentation - only the presenter has ! (the presenter can involve the viewers thought)

D:(It cannot reach a large audience.)
This is false - a multimedia presentation can typically reach a wider audience than a non-multimedia one!