Select the most appropriate option to fill in blank no. 1.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. experts.
The passage talks about speech disabilities. As the passage starts with a plural subject, so filler 1 should also take a plural form of the word. So, the word experts will fit the sentence correctly which means a person who has a lot of special knowledge or skill.