[单选题]
03.43: The diagram shows tw k;cpq*w7we zycf)z7 f0k+gl+o idxy9hi 99kvh y :r-smj7entical positive charges located at points 4 and 6 on r :i -m7y hj9vy9xsh9kthe positive x axis. Which of the following graphs best represent the electrical potential along the axis?