As of my last knowledge update in October 2023, specific percentages for undernourishment in Algeria can vary by source and year. However, the prevalence of undernourishment in Algeria is usually reported to be below 5%. Therefore, among the options provided, the most accurate choice would likely be Below 5.
For the most current and specific statistics, it is advisable to check reports from organizations such as the Food and Agriculture Organization (FAO) or the World Food Programme (WFP).