Question

this is an excerpt from an article published in the jerusalem post in 2012.
here in brief is the case for jewish settlements in the west bank:
it is in israels acute national interest to prevent the west bank from serving as a terrorist base, from which rockets, mortars and possibly weapons of mass destruction would be launched at israel.
...
the only way effectively to prevent the conversion of the west bank into a hamastan terror base is by maintaining a significant jewish population there.
...
since most of the settlers are actually living in jerusalem suburbs, their presence there also prevents any capitulations by israel to pressures regarding relinquishing jerusalem.
what reason does plaut give to justify jewish settlements on palestinian land?
○ to prevent the west bank from developing weapons of mass destruction
○ to prevent the west bank from becoming a terrorist base
○ to prevent the west bank from becoming economically independent
○ to prevent the west bank from relinquishing jerusalem

Explanation:

The excerpt states that preventing the West Bank from becoming a terrorist base (specifically a "Hamastan terror base") is justified as Israel's acute national interest, and maintaining a Jewish population there is the effective way to do this. The other options either misstate the threat (WMDs are only a possible secondary concern, not the core justification) or are a secondary, separate point (Jerusalem) not the main reason for settlements on Palestinian land in the West Bank.

Answer:

to prevent the West Bank from becoming a terrorist base