Which of the following is the most appropriate strategy to explain that 1/4 is less than 1/3?

Using paper strips is the most appropriate concrete strategy to show that 1/4 < 1/3 at the primary level. Students can fold identical paper strips into 4 equal parts and 3 equal parts respectively, then visually compare 1/4 and 1/3 by placing the strips side by side. This hands-on visual demonstration helps children understand that when the whole is divided into more parts, each part becomes smaller. LCM method is too abstract for primary children, Dienes blocks are designed for whole number place value, and number charts don't easily show fractional comparison.