The sentence On utilise une regle pour ___ means "A ruler is used for ___." This question tests knowledge of school supplies and their functions.
A regle (ruler) is a flat, straight tool marked with units of measurement. Its primary function is to mesurer (measure) - to determine lengths, draw straight lines, and mark distances.
The other options describe actions associated with different tools:
effacer (to erase) is the function of une gomme (an eraser)
peindre (to paint) is done with un pinceau (a paintbrush)
couper (to cut) is done with des ciseaux (scissors) or un couteau (a knife)
The complete sentence is: On utilise une regle pour mesurer - A ruler is used for measuring.
