Baby carlos is playing with a shape-sorting toy. at first, he tries to fit every block in every opening until one fits. after a week, carlos is able to get most of the blocks into the correct opening on the first try. what type of learned behavior is this? conditioning imprinting instinct trial-and-error learning

I believe that the correct answer is trial-and-error learning

The answer is trial-and-error learning. Carlos attempted the fit the block but kept getting it incorrect. These incorrect attempts helped him try another way which could be wrong or right. In the end, after many attempts and errors, he got it right. Hope this helped :))

"d.) carbon dioxide and hydrogen sulfide"