As rainfall began to decrease in the Southwest about the middle of the twelfth century, most of the Monument Valley Anasazi abandoned their homes to join other clans whose access to water was less limited.

A. whose access to water was less limited
B. where there was access to water that was less limited
C. where they had less limited water access
D. with less limitations on water access
E. having less limitations to water access


The OA is A..

My question is, can "whose" refer to plural nouns.. "clans" in this case..