From the options given below, select the option which states the correct combination of correct sentences.
I. The minister emphasized that every citizen must contributes towards nation-building, irrespective of their socio-economic background or personal interests. 
II. Hardly the meeting had begun when several participants started raising objections regarding the proposed amendments. 
III. The data collected from various sources indicate that there are significant discrepancies in the reported figures. 
IV. Each of the candidates has been instructed to submit their documents before the deadline to avoid disqualification.