Step 1: Recall the Fact:
Think of where working parents leave a baby for the full day. The passage names two such all-day programmes.
Step 2: Test each choice against this fact.
Choice 1 (Montessori schools): This is a pre-school, which suits older children who are ready for a learning environment, so it does not fit infants.
Choice 2 (Hostel): This is a place to stay for older students. It gives no childcare, so it is out.
Choice 3 (Crèche): This is a place built to look after infants and toddlers when no one is at home. It matches the description word for word, so it is correct.
Choice 4 (Anganwadi centre): This is a rural centre mixing nutrition, health and play-based learning. It is not the term the passage gives for infant care, so it is not chosen.
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:
A crèche is the setting for infants in the absence of home care, which is choice 3.
\[ \boxed{\text{Crèche}} \]