The broker advised his client to diversify his investement portfolio across multiple sectors to minimise risk and maximise returns.

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 answer is investement.

Step-by-Step Explanation:

1. Analyze the sentence:
"The broker advised his client to diversify his investement portfolio across multiple sectors to minimise risk and maximise returns."

2. Evaluate the highlighted/option words for spelling and usage:

• advised: Used correctly as a verb meaning to offer suggestions about the best course of action. The spelling is correct.
• diversify: Used correctly as a verb meaning to enlarge or vary the range of products or field of operation. The spelling is correct.
• investement: This word is misspelt. The correct spelling is investment (without the extra 'e' between 't' and 'm').
• returns: Used correctly in a financial context meaning the yield or profit from an investment. The spelling is correct.

3. Conclusion:
The erroneous word with a spelling mistake is investement (correct spelling: investment).