Final answer:
Systolic heart failure is characterized by a decrease in ventricular contraction strength, resulting in decreased blood volume ejected from the ventricle.
Step-by-step explanation:
Systolic heart failure is characterized by a decrease in ventricular contraction strength, resulting in decreased blood volume ejected from the ventricle (option D). This decrease in blood volume can lead to a decrease in renal perfusion (option A) and dehydration (option B) due to decreased blood flow and fluid loss, respectively. However, systolic heart failure does not correlate with vasodilation of the skin (option C).