Which is one ongoing obstacle to peace between Israel and Palestinian Arabs?

A.

Israel will not give up its settlements on the Sinai Peninsula.
B.

Palestinians want to take back land that once belonged to their families.
C.

The Palestine Liberation Organization (PLO) continues to deny Israel's right to exist.
D.

Egypt has refused to negotiate with Israel.

B. Palestinians want to take back land that once belonged to their families is one ongoing obstacle to peace between Israel and Palestinian Arabs.

To identify the ongoing obstacle to peace between Israel and Palestinian Arabs, let's analyze each option:

A. Israel will not give up its settlements on the Sinai Peninsula.
Explanation: This statement is incorrect. Israel does not have settlements on the Sinai Peninsula. The Sinai Peninsula is actually part of Egypt, not under Israeli control. Therefore, this option is not an ongoing obstacle to peace.

B. Palestinians want to take back land that once belonged to their families.
Explanation: This statement is partly accurate. The issue of land is indeed a significant factor in the Israeli-Palestinian conflict. Palestinians want to reclaim land they believe belonged to their families before the creation of the State of Israel in 1948. The competing claims for land and territories have been a major obstacle to peace negotiations.

C. The Palestine Liberation Organization (PLO) continues to deny Israel's right to exist.
Explanation: This statement is partially accurate. While the PLO, in the past, did not recognize Israel's right to exist, it has since officially recognized Israel's right to exist within the pre-1967 borders. However, there are still factions within Palestinian society that deny Israel's right to exist, which can contribute to the ongoing tensions.

D. Egypt has refused to negotiate with Israel.
Explanation: This statement is incorrect. Egypt has actually negotiated and signed peace treaties with Israel. The Camp David Accords of 1978 led to a peace treaty between Egypt and Israel, establishing diplomatic and economic relations and ending decades of hostilities.

Based on the analysis, the correct answer would be option B. The desire of Palestinians to reclaim land they believe belonged to their families is an ongoing obstacle to peace between Israel and Palestinian Arabs.

C. The Palestine Liberation Organization (PLO) continues to deny Israel's right to exist.