Je kunt op mij vertrouwen. (You can rely on me.)
vertrouwen takes "op" (vertrouwen op = to rely on). Example: Je kunt op mij vertrouwen. (You can rely on me.)
Je kunt op mij vertrouwen. — You can rely on me. The preposition op is fixed, so it doesn't change with the sentence.
Fixed prepositions come up all over the A2 exam. The platform drills them in real exam tasks, AI-graded across all five DUO sections.