The figure below displays the temperature and dew point temperature at Boeing Field over time. Overnight, clear skies and near calm winds facilitated a decrease in temperature and the formation of dense fog. Sunrise occurred at 1445 UTC or ___ PDT 8:45 pm / 7:45 am / 8:45 am / 9:45 pm / 6:45 am  Examine the shaded regions of the figure. During which time period did fog occur? A / B / C

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