Answer:
The correct option is B. A hypothesis
Step-by-step explanation:
Scientific method can be described as a method following which all scientific researches are made. The scientific method begins with a question. To answer this question, a hypothesis is derived.
A hypothesis can be described as a statement based on which observations are made end experiments are done. A hypothesis is a tentative statement. As the student in the question writes a tentative statement in his/her journal, hence it is most likely to be a hypothesis.