It does not seem like one vote can make a difference. Every eligible person should vote.

Which revision offers the most improvement in sentence fluency?

Although it does not seem like one vote can make a difference, every eligible person should vote.

It does not seem like one vote can make a difference, although every eligible person should vote.

It does not seem like one vote can make a difference because every eligible person should vote.

Since it does not seem like one vote can make a difference, every eligible person should vote.