Which element of interpersonal attraction is most likely to be a source of long-term maintenance attraction rather than one of short-term initial attraction?

A) physical attraction
B) charisma
C) proximity
D) attitude similarity

Attitude similarity is more likely to be a source of long-term maintenance attraction because as people get to know each other better over time, sharing common beliefs and values becomes more important for sustaining the relationship. Physical attraction, charisma, and proximity are more likely to contribute to short-term initial attraction, but may not be enough for long-term maintenance.