Question

read this part of the text. the author explains that an octave is a \musical interval.\ the author helps readers understand what this means by
a giving a definition in the next sentence.
b giving a word with the opposite meaning.
c sharing a quote from another person.
d making an inference or guess.
consider this conveniently labeled series of sounds: do-re-mi-fa-so-la-ti-do. the first do and the last do are separated by the musical interval known as an octave. basically, they are the same musical note, only the second note is higher than the first.

Explanation:

The author gives a definition of "octave" as a "musical interval" in the text. Then, in the following sentences, the author further elaborates on what an octave is (e.g., Do - re - mi - fa - so - la - ti - do, the first Do and the last do are separated by the musical interval known as an octave. Basically, they are the same musical note, only the second note is higher than the first). This is a way of giving a definition and then explaining it further in the next sentences.

Answer:

A. giving a definition in the next sentence.