Franco lancia un pallone orizzontalmente dal tetto di un fienile con una velocità iniziale di 15m/s, sapendo che atterra a 20m dalla base del fienile. Calcola il tempo di volo e l’altezza del fienile

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

Caused conformity rates to go down. apex ; )

Wouldnt it be millileter