Dietary Fats and Oils Are Structurally Both Triglycerides, but Fats

Dietary fats and oils are structurally both triglycerides, but fats are solids and oils are liquids at room temperature.Which of the following best describes the reason for their difference in physical state?

A) Fats contain 3 identical fatty acid R groups and oils contain different R groups.
B) Oils contain 3 identical fatty acid R groups and fats contain different R groups.
C) Oils contain longer fatty acid R groups than fats do.
D) Fats contain more hydroxyl groups in their fatty acid R groups than oils do.
E) Oils contain a higher percentage of unsaturation in their fatty acid R groups than fats do.