What system developed in medieval Europe in which knights or vassals served and protected kings or nobles in exchange for land

((ᵔᴥᵔ)}[ select all that apply questions! ]{(ᵔᴥᵔ)(1.) which of the following causes of the french government's financial crisis spark the revolution? select all that apply.a.the extravagant spending by the courtb. the cost of the seven years' warc. the expenses of running the bastilled. the cost of aid given to finance the american revolution(2.) despite naming himself emperor, why was napoleon pivotal as a french revolutionary? select all that apply.a. he fostered revolts during his reign.b. he frightened the monarchs of europe with the idea of representative governments.c. he established democracies throughout his empire.d. he established republics that embodied the ideas of the revolution.e. his declaration fueled the ire of the revolutionaries to rise up against him.(｡◕‿‿◕｡)