Final answer:
Spearmint oil in a snowman bath bomb serves to refresh and invigorate senses, leave skin feeling cool and minty, and increase blood flow, making option 4 'All of the above' the correct answer.
Step-by-step explanation:
The function of spearmint oil in the snowman bomb is multifaceted. Primarily, spearmint oil is used in aromatherapy and topical applications for its ability to refresh and invigorate the senses. In the context of a bath bomb, spearmint oil can provide a cooling sensation to the skin, which would leave skin cool and minty. Additionally, the oil has properties that can help increase blood flow, potentially helping to relax muscles and improve skin health. Therefore, the correct answer would be 4) All of the above.