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:

Let's analyze the highlighted words in the given sentence to identify any spelling or usage errors:

1. advised: This is the correct past tense form of the verb "advise", which means to give suggestions or advice to someone. Its spelling and usage are correct.

2. diversify: This is a verb meaning to enlarge or vary the range of products or field of operation. Its spelling and usage are correct.

3. investement: This word is misspelled. The correct spelling is investment (without the extra 'e' between 't' and 'm').

4. returns: This refers to the gain or profit yield from an investment. Its spelling and usage are correct.

Therefore, the word with the spelling error is investement.