The name concrete operations describes how children (A) handle materials to solve problems.
(B) use what they have experienced to solve problems.
(C) reason abstractly to solve problems.
(D) develop hypotheses.
Yes

use what they have experienced to solved problems .

european feudalism was a combination of legal and military customs in medieval europe that flourished between the 9th and 15th centuries. broadly defined, it was a way of structuring society around relationships derived from the holding of land in exchange for service or labour.

japanese feudalism. the era of feudalism in japan took place from the 12th through 19th centuries. during that period local rulers, either powerful families or military warlords, dominated the land, while the emperor was merely a figurehead and not a significant political presence.

the answer is d.index