What impact did the frankish leader charles martel have on christian europe's relations with muslim spain in the eighth century?

He stopped the Muslim advance in France

Explanation:

Charles Martel was a statesman and a military leader of the Franks during mid-8th century. At that time, the Iberian peninsula was under Muslim rule and the Muslim armies of the kingdom of Abderrahman marched further into the North. By 725 they had already conquered the Languedoc and much of Burgundy and were trying to reach the center of the Frankish territory, but they faced the armies of Charles Martel.  

Charles Martel forced them to retire to the Rhone Valley in 736, conquered Avignon in 737 with his brother Childebrand, but did not get Narbonne. Then he allied with the Lombards to reconquer Provence. All the lords who had collaborated with the Arabs were punished and their property distributed among the Frankish warriors. The Muslim armies were expelled from France. These battles helped to unify the Frankish kingdom around Charles Martel.

the answer is prolly b

a. by accepting the election of president abraham lincoln in 1860 and convincing other southern states to do the same