Which of the following is an example of a consonant blend?

A consonant blend is a combination of two or more consonants that, when placed together, retain their individual sounds. The option "bl" is a prime example of a consonant blend, as both the "b" and the "l" sounds are pronounced distinctly when the blend is articulated. This blend is commonly found at the beginning of words, such as "black" and "blue."

In contrast, the other options represent digraphs, where two letters come together to create a single sound rather than retaining their individual sounds. For instance, "sh" produces a single, unique sound /ʃ/ as in "shirt," "th" results in /θ/ or /ð/ as in "think" or "that," and "ch" represents the /tʃ/ sound as seen in "chop." These combinations do not function as consonant blends because they do not maintain the distinct pronunciation of each consonant.