All that you have commanded us we will do, and wherever you send us we will go. ...

The question is asking who made a pledge to Joshua in the Bible. The pledge was, "All that you have commanded us we will do, and wherever you send us we will go. Just as we obeyed Moses in all things, so we will obey you." The options are Reubenities, the Gadites, and part of the tribe of Manasseh (Option A - Correct), twelve tribes of Israel (Option B), two spies sent to Jericho (Option C), and seventy elders (Option D).

The correct answer is Option A - Reubenities, the Gadites, and part of the tribe of Manasseh. This pledge was made by these tribes to Joshua after they were allotted land on the east side of the Jordan River. They promised to obey Joshua just as they had obeyed Moses. This story can be found in Joshua chapter 1.

It is important to note that Joshua was a leader of the Israelites after Moses died. He led them into the Promised Land and was responsible for dividing the land among the tribes. The story of Joshua is an important part of the Old Testament and illustrates the importance of obedience to God and his leaders.

To learn more about this, please read the relevant sections of the recommended textbooks.