What event following La Salle's death impacted settlement in Arkansas? A. Joliet and Marquette established a trading post along the Red River.
B. Colbert befriended Native Americans and settled at the confluence of the Arkansas and Mississippi Rivers.
C. De Soto continued La Salle's mission and discovered the mouth of the Mississippi.
D. De Tonti went in search of La Salle and founded the Arkansas Post.

The answer is D

Explanation:

De Tonti founded the Arkansas Post after La Salle’s death because, it says after La Salle died several men continued to explore, De Tonti was one of those men.  Then De Tonti Stayed in an area we now know as Missouri, and after not hearing from Le Salle for 2 years he headed south.  Then in 1686 he settled near the confluence of the Arkansas and Mississippi Rivers. Here he established the first permanent European settlement in Arkansas called the Arkansas Post.  

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Explanation:

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i feel as if they would both catch on before to long because they would see them to frequent

answer; archaeologists;