Two long straight wires enter a room through a window. one carries a current of 3.0 into the room while the other carries a current of 5.0 out. the magnitude in tm of the path integral ∮ ⃗ ∙ around the window frame is:

This is kenetic energy.

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

The fertilized egg  begins to develop into a hollow ball of cells called the blastocyst. 

Ithink c because you have to work to become goid