The answer to your question is C
Answer:
You say there is one twin. Twins, when referred to as a set, require an s, just like most other groups of objects. There are the twins.
Responding to conflict with confrontation will just lead to more and more arguments with peers, family members and loved ones. People will start to avoid the friend because many people do not like confrontation and prefer to deal with conflict in a calmer more understanding way. The friend needs to take that approach in order to sustain positive relationships. The calmer the approach to conflict the better. A mutually supported understanding needs to be reached in conflicts in order to resolve them peacefully. Aggression and confrontation just leads to more anger and upset.
It's more what do you put in front of them to let them try. The example usually discussed has mostly to do with shapes and color and properties than it does with a set curriculum. Light is a usual example of what can be tried. One picture was of a couple of kids (very young) who copied the the pattern of shadows that a picket fence produced. They were engrossed in how to record what it looked like and what angle the shadows made. You have at least 2 subjects that are being appealed to.
The main thing is that the project must be student centered. It is not the teacher's job to design a curriculum; it is the student's. Evaluation is done mostly by camera (taking pictures of what the students do), voice recording and other "visual aides." It is not so much pass fail as it is how done.