Mark the only option in which the word(s) in bold type express(es) an idea of hypothesis/condition.
"but controllers also must direct planes efficiently " (line 6 ).
"In addition, controllers keep pilots informed about changes in weather conditions " (lines 17-18).
"...such as wind shear, a sudden change in the velocity or direction of the wind " (lines 18-20).
"If the path is clear, the controller directs the pilot to a runway;" (lines 27-28).
"As the plane nears the runway, the pilot is asked to contact the tower." (lines 30-31).
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