Correct Answer: Seldom complaint

Solution : The fourth option is correct.

• Replace complaint with complain to make the sentence correct.
• Complain and complaint are two words that are used to express dissatisfaction or annoyance about something.
• The main difference between complain and complaint is that complain is a verb, whereas complaint is a noun
• Complain is a verb that is used to express annoyance or dissatisfaction about something.
• A complaint is a noun defined as a statement that something is unacceptable and unsatisfactory.
• In the given sentence, complain should be used as a verb because the implied meaning of the sentence is: People who are happy rarely whine about their circumstances .

Therefore, the correct sentence would be: Contented people seldom complain against their fate.