Step 1: Recall the Fact:
Only one person with the surname Montessori is known as the founder of this education method. Find her first name.
Step 2: Test each choice against this fact.
Choice 1 (James Montessori): This first name is wrongly attached to the surname. No such founder exists, so it is rejected.
Choice 2 (Mathew Montessori): This is another wrong first name for the surname. It is rejected.
Choice 3 (Gwen Montessori): This is a third wrong first name for the surname. It is rejected.
Choice 4 (Maria Montessori): Maria is the real first name of the Italian educator who gave her name to the schools. It is accepted.
Step 3: Cross-check the result.
Read the sentence once more with the chosen term in the blank. It should agree with the passage and with what is taught in the unit on early childhood care. Only one choice passes this test, and the other three each break one clear fact stated above. Each wrong choice names a different stage, place or person that does not match the clue in the question.
Final Answer:
The founder of Montessori education is Maria Montessori, choice 4.
\[ \boxed{\text{Maria Montessori}} \]