A suspension of alumina particles has the following properties: A zeta potential of +20 mV. a sodium chloride salt concentration of 1 mM and an alumina particle radius of 100 nm. If all these variables are kept constant but the weight fraction (wt%) of the suspension increases from 0.1 wt% to 15 wt%, select the correct statement from the choices below. (a) the time to the first coagulation event would decrease with an increase in particle weight fraction. (b) the time to the first coagulation event would remain constant with an increase in particle weight fraction. (c) the time to the first coagulation event would increase with an increase in particle weight fraction. (d) the time to the first coagulation event would first increase for cases from 0.1 wt% to 5 wt% cases and then decrease for cases above 10 wt%