Answer:
The subject in the sentence is "I."
Step-by-step explanation:
The subject of a sentence is typically the part of the sentence that performs the action or is described in the sentence. In the sentence "I don't go in the basement because of my fear of spiders," the word "I" is the subject because it is the one who is performing the action of not going into the basement due to the fear of spiders. It's the person who is the central focus of the sentence and the one taking the action.