The objective of the reserch is to gain a better insight into labour market processes
In the sentence given below, 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, then choose option ‘No error’ as the answer.

The correct answer is reserch.

Let us analyze the highlighted words in the given sentence to check for errors in spelling or usage:
1. objective: This word is spelled correctly and is used appropriately as a noun meaning "goal" or "aim".
2. reserch: This word is misspelled. The correct spelling is research (with an 'a' after the 'e'). It refers to the systematic investigation into and study of materials and sources in order to establish facts and reach new conclusions.
3. insight: This word is spelled correctly and is used appropriately to mean a deep understanding of a person or thing.
4. processes: This word is spelled correctly and is used appropriately as the plural form of "process", referring to a series of actions or steps taken to achieve an end.

Therefore, the erroneous word is "reserch", and its correct spelling should be "research".