Which of the following is a preventive measure against ticks?

Using insect repellent on exposed skin is a highly effective preventive measure against ticks. Repellents that contain DEET or other EPA-registered active ingredients have been shown to significantly reduce the likelihood of tick bites. When applied correctly to exposed skin and clothing, these products create a barrier that makes it more difficult for ticks to attach themselves.

Wearing short sleeves outdoors can increase skin exposure and the chances of a tick attachment, while walking in wooded areas during daylight does not necessarily reduce the risk of encountering ticks, as they are active at various times, including in cooler weather and shaded areas. Likewise, wearing sandals instead of closed shoes can expose your feet and ankles to ticks, which can hide in grass and brush, increasing the risk of bites. Therefore, while the other options present various outdoor behaviors, only the use of insect repellent offers a direct protective strategy against tick bites.