The result of the research which was made on English-speaking Canadian children showed that if they were taught only French, then this brought about an B. improvement in intellectual aptitude
This refers to the systematic way of finding out things, the way they occur, and why they occur, usually using the scientific method.
Hence, we can see that when the researchers made their findings on English-speaking Canadians, they found out that if they were taught only French, then this brought about an improvement in intellectual aptitude
Read more about research here:
https://brainly.com/question/26177190