Explain why the cis and trans isomers of the given alkene show no coupling between the a and c, as well as between the b and c protons.

There is no coupling between a and c and between b and c protons because they are both too near to each other.

There is no coupling between a and c and between b and c protons because they are 6 and 4 pi bonds away from each other, respectively.

There is no coupling between a and c and between b and c protons because they are 4 and 6 sigma bonds away from each other, respectively.

There is no coupling between a and c and between b and c protons because they are 4 and 6 pi bonds away from each other, respectively.