I believe the correct answer from the choices listed above is the last option. It is hypothesis that is a tentative answer to a question. A hypothesis (plural hypotheses<span>) is a proposed explanation for a phenomenon. </span> Hope this answers the question. Have a nice day.
Tom is baking a cake - present tense
Present tense: a tense expressing an action that is currently going on or habitually performed, or a state that currently or generally exists.
