Three friends: Andrés, Juan and Carlos are preparing to climb some stairs and they do it in the following way: each one begins their journey by placing their left foot on the first step. Andrés climbs a step alternating his feet. Juan goes up two steps at a time, alternating his feet, and Carlos goes up three steps at a time, alternating his feet. If everyone reaches the last step of the ladder with their left feet, then. The minimum number of steps the staircase has is? A:7 B:9 C:13 D:25

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