Correct option is A
The correct option is (a).
• Explanation: The passage gives information about autism in Australia, especially among children, their difficulties, and teaching methods. Hence, the main focus is autism among Australians.
• Correct answer word – autism among Australians
Meaning: discussion about autism cases in Australia
Example: Autism among Australians is increasing.
Meanings of other options:
• learning environment – only one aspect
• gain social skills – partial focus
• everyday task – not main idea