In each of the following questions, a sentence with four highlighted words is provided. These highlighted words may be either misspelled or used inappropriately. Select the incorrect word as the answer, and if all the highlighted words are correct in spelling and usage, choose ‘All are correct’ as answer.

The children's favorite activities at the camp was hiking through the forest trails.

Correct Answer: activities

Step-by-Step Explanation:

1. Analyze the Subject-Verb Agreement:

The sentence uses the singular linking verb "was" ("...was hiking through the forest trails").

In English grammar, a singular verb must agree with a singular subject noun. However, in the sentence, the subject noun phrase uses the plural noun "activities" ("The children's favorite activities...").

2. Identify the Incorrect Word:

Since the camp involved a single primary activity mentioned ("hiking"), or because the verb is singular ("was"), using the plural noun "activities" creates a grammatical subject-verb agreement error. To make the sentence grammatically correct, the singular form "activity" should be used instead ("The children's favorite activity at the camp was hiking...").

3. Check the Other Highlighted Words:

• favorite: Spelled correctly and used appropriately as an adjective describing the activity.
• hiking: Spelled correctly and used appropriately as a gerund acting as the predicate noun.
• trails: Spelled correctly and used appropriately as a noun in the plural form referring to paths through the forest.

Therefore, the word that is used inappropriately is activities.