【单选题】In Barcelona the Catalonians call them castells, but these aren't stereotypical castles in Spain. These castles are made up of human beings, not stone. The people who perform. this agile feat of acrob...
A.
all Catalonians can perform. castells.
B.
castells require performers to stand on each other.
C.
people perform. castells in different formations,
D.
in castells people have to push and pull each other.