Why did craft guilds form in the middle ages?
a)to eliminate the growing number of merchant guilds in european towns
b)to address religious and political corruption
c)to eliminate competition between artisans
d)to provide structure and support for artisans who shared a trade

The correct answer is D, as craft guilds formed in the Middle Ages to provide support for artisans who shared a trade.

Guilds were merchant corporations; a habitual form of association during the Late Middle Ages.

They functioned institutionally in an equivalent way to a union of artisans, that is, as the meeting of a group of people who share a common activity, choose managerial positions, endow themselves with specific rules that bind all of them and share the same rights or freedoms. Such concepts did not have the same value that they acquired in the Contemporary Age and were understood as a form of privileges compatible with a marginal situation in the feudal socioeconomic system, which from the last centuries of the Middle Ages (especially since the crisis of the century XIV) was in a slow process of crisis and transformation, in transition to capitalism. The wealthy merchants of the guilds, although they could not be part of the privileged estates, could reach a high economic position.

the minoan civilization flourished in the middle bronze age on the island of crete located in the eastern mediterranean from c. 2000 bce until c. 1500 bce. with their unique art and architecture, and the spread of their ideas through contact with other cultures across the aegean, the minoans made a significant contribution to the development of western european civilization as it is known today. labyrinth-like palace complexes, vivid frescoes depicting scenes such as bull-leaping and processions, fine gold jewelry, elegant stone vases, and pottery with vibrant decorations of marine life are all particular features of minoan crete.  

so basically their unique way of ding arts, as well as architecture.