The question asks which site-excavator combination is incorrect. Option C is the incorrect combination - Banawali was actually excavated by R.S. Bisht (1974-75), not Fazal Ahmed. The other combinations are essentially accurate: Mohenjodaro by R.D. Banerjee (despite 'Benarzi' typo), Kalibangan by A.N. Ghosh, and Dholavira by J.P. Joshi and R.S. Bisht.