The investor carefully studied the quarterly reports before deciding to diverse his holdings across real estate, bonds and emerging markets.

In the following sentence, four words have been highlighted which may be misspelt or inappropriate in their usage. Mark the erroneous word as the answer and if all the words are correct in their spellings and usage, choose ‘All are correct’ as the correct answer.

The correct option/answer is diverse.

Step-by-Step Explanation:

1. Analyze the context of the sentence:
The sentence discusses an investor making an active decision to spread investments across different asset classes (real estate, bonds, and emerging markets).

2. Identify the grammatical role required:
In the construction "deciding to [word] his holdings", the word following "to" must function as a verb in its base form (infinitive form: to + verb).

3. Examine the word "diverse":
"Diverse" is an adjective meaning showing a great deal of variety or very different. It is not a verb.
The correct verb form meaning "to give variety to" or "to spread investments into several areas" is diversify.

4. Check the other highlighted words:
• carefully: An adverb correctly modifying the verb "studied".
• quarterly: An adjective correctly modifying the noun "reports".
• emerging: A participle acting as an adjective correctly modifying "markets".

Therefore, the word diverse is used incorrectly in place of the verb diversify.