Final answer:
The event 'getting at least one tails' in two coin tosses includes any outcomes with one or more tails, which are HT, TH, and TT.
Step-by-step explanation:
The event of getting at least one tails when tossing a coin twice includes any outcome where there is a minimum of one tail present. Given the sample space for two coin flips, which is {HH, HT, TH, TT}, where H stands for heads and T stands for tails, the specific outcomes that correspond to at least one tails would be HT, TH, and TT. Therefore, the correct answer is B. HT, C. TH, and D. TT.