thE unDErlinED worD "oFFiCiAls" (pArA. 4) most proBABly rEFErs to ______.
A．thE rEsEArChErs involvED in thE ExpErimEnt
B．thE inspECtors oF thE FootBAll tournAmEnt
C．thE rEFErEEs oF thE FootBAll tournAmEnt
D．thE oBsErvErs At thE sitE oF thE ExpErimEnt