Select the sentence containing the homonym of the highlighted word:

The choir began the canon at the conductor’s signal.

The correct option is: The photographer adjusted the canon before taking the shot.

Step-by-Step Explanation:

1. Understand Homonyms:
Homonyms are words that have the same spelling and the same pronunciation but have different meanings depending on the context in which they are used.

2. Analyze the original sentence:
In the sentence "The choir began the canon at the conductor’s signal," the word canon refers to a piece of music in which a melody is repeated by one or more voices or instruments (a musical composition technique).

3. Evaluate the given options for a homonym:

- "The photographer adjusted the canon before taking the shot."
Here, canon is used incorrectly in place of or as a homonym/homophone referring to a camera (or confused with camera/cannon), creating a completely different meaning/context than the musical composition meant in the original sentence. In this context, it refers to an object/equipment rather than a piece of music, demonstrating a homonymic usage (different meaning).

- "The canon echoed beautifully through the hall."
Here, canon refers to the same musical piece echoing.

- "The singers practised the canon repeatedly before the performance."
Here, canon again refers to the musical piece being practiced by singers.

- "The composer introduced a complex canon in the final movement."
Here, canon refers to the musical composition introduced by the composer.

Therefore, the sentence that uses canon in a completely different context/meaning from the musical composition is "The photographer adjusted the canon before taking the shot."