Select the sentence containing a homonym of the highlighted word:

She decided to ring her sister as soon as she arrived at the train station.

The correct option is:
He slipped a gold ring onto her finger during the ceremony.

Step-by-Step Explanation:

1. Understand the concept of Homonyms:
Homonyms are words that share the exact same spelling and pronunciation but have completely different meanings contextually.

2. Analyze the highlighted word in the given sentence:
In the sentence "She decided to ring her sister as soon as she arrived at the train station," the word ring is used as a verb meaning to telephone or make a phone call to someone.

3. Evaluate the options:
- "Please ring the doorbell when you reach the main entrance." -> Here, "ring" refers to causing a bell to sound (verb/related sense).
- "He heard the bell ring loudly throughout the school courtyard." -> Here, "ring" refers to making a sound (verb/related sense).
- "The loud alarm continued to ring for several minutes." -> Here, "ring" also refers to producing a sound (verb/related sense).
- "He slipped a gold ring onto her finger during the ceremony." -> In this sentence, ring is a noun referring to a circular band worn as an ornament on a finger. This has a completely different meaning (a piece of jewelry) from the verb meaning "to call on the telephone", despite having the exact same spelling and pronunciation. Therefore, it is a homonym of the highlighted word.