Answer:
A) Also, I wanted to tell you that I
Step-by-step explanation:
The whole sentence reads-
Also I wanted to tell you that I plan to run for president.
In the above sentence, the speaker is giving an added information after she has said everything. With this in mind, the comma will be placed just after "Also" as it suggests that the next words or sentence (in this case) is an added information aside from the already told information.