Directions: Fill in the blank with appropriate word from the given options. The principal & staff have made ________ efforts to enable the students to attend college on the days of the bus strike.

Concerned is correct - it means 'worried, troubled, or involved' indicating the staff made efforts out of concern for students' attendance during the bus strike. Systematic means organized but doesn't capture the caring motivation. Integrated suggests combining efforts, which isn't the point. Respective means 'belonging to each' which doesn't fit. Concerned efforts shows the staff's caring approach.