Answer:
I feel overwhelmed because I have too much to do.
Step-by-step explanation:
This sentence does not have a subject. The second answer, I feel overwhelmed because I have too much to do, is the only one that is a correct sentence.
"Running around the house with too much to do." still does not have a subject (who is doing the running?).
"My mom and aunt too much to do." does not have a verb (this statement is missing 'have').
"Way too much to do today!" is also missing a subject (is it you who has too much to do? Your sister? Christina? Bob? Who has too much to do?).