Building children develope their skills
a. number sense and operations
b. operations and geometry
c. measurement and counting
d. measurement and geometry

I'll say number sense and operation

Explanation:

this is because it will show how creative and Intelligent that child is,and it will help increase thier brain functions

c

Explanation:

well, they have to count how high their building is and measure the sides and make sure it won't fall over.