The correct answer is A. Sweat
Step-by-step explanation:
Eccrine glands are a type of glands mainly located on the skin and that produce sweat, indeed in humans, these are the major glands that produce sweat which is necessary for regulating body temperature. Additionally, the location and concentration of eccrine glands in animals vary, for example in humans are located in all body but have a higher concentration on palms and soles while in animals with fur they tend to concentrate on areas without hair. Considering this, it can be concluded eccrine glands produce sweat.