Meaning of "turn the volume up"

[Sophie]

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", question 3

She put her favourite CD on and turned it up full blast.

(a) to complete volume
(b) to exact volume
(c) to fine volume
(d) to maximum volume

English Idioms and Expressions, Advanced Level

ESL/EFL Test #4 "How Mary fell in love", answer 3

She put her favourite CD on and turned it up to maximum volume.

Correct answer: (d) to maximum volume
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Explain me this, please

Sophie

[Yankee]

Hi Sophie

To make the sound from a CD (or TV or radio, etc.) louder, you "turn the volume up".

"Full blast" is the loudest possible volume (sound level). So, "turned it up full blast" means you've turned the volume up all the way up to the maximum loudness.

Amy