Answer:
The correct option is: reduce a microbial population by 90%
Explanation:
In a sterilization procedure, the decimal reduction time is the required time to achieve a log reduction i.e. reduce the microbial population by killing the 90% of the relevant microbial population, at the given set of conditions. Therefore, after the exposure time of 1 D, only 10% of the microbial population remains.
