Achlorine atom has seven valence electrons how could two chlorine atoms bond so that each atom has a ocet of valence electrons

A chlorine atom has seven valence electrons, two chlorine atoms bond so that each atom has an octet of valence electrons by covalent bonding. The two chlorine atoms stick together is that the shared pair of electrons is attracted to the nucleus of both chlorine atoms. Hope this answers the question. Have a nice day.

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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