A syllable can be defined as

a a type of speech.

b a unit of sound in speech.

c a pattern of rhyme.

b a unit of sound in speech.

A syllable can be defined as:

a unit of sound in speech.

To determine the definition of "syllable," we can consult a reputable source such as a dictionary. One commonly used dictionary is the Merriam-Webster Dictionary. Here's how you can find the definition using this source:

1. Open a web browser and navigate to the Merriam-Webster website (www.merriam-webster.com).
2. On the homepage, you'll see a search bar. Enter "syllable" into the search bar and press Enter or click on the magnifying glass icon.
3. The search results page will display various entries related to "syllable." Look for the entry that specifically defines the term.
4. Click on the relevant entry to view the full definition and related information.

According to the Merriam-Webster Dictionary, a syllable is defined as:

b: a unit of spoken language that is next bigger than a speech sound and consists of one or more vowel sounds alone or of a syllabic consonant alone or of either with one or more consonant sounds preceding or following

Therefore, option 'b' is the correct definition of a syllable. It refers to a unit of sound in speech, which can consist of one or more vowel sounds alone, a syllabic consonant alone, or a combination of vowel sounds and consonant sounds.