progress
development
growth
advancement
Answer is Right!
Answer is Wrong!
The correct answer is progress.
Progress is the act of moving forward or making headway. It can be used in a variety of contexts, including academic studies. In this case, the boy made good progress in his studies means that he was learning and improving at a good rate.
The other options are not as accurate. Development is the process of growing or developing, and growth is the act of increasing in size or number. Advancement is the act of moving to a higher position or level. While these words can be used in a positive sense, they do not accurately capture the meaning of the sentence.
In conclusion, the correct answer is progress.