GKFix MCQ Question

What is the main difference between isotopes and isobars?

• A. Isotopes are of different elements, isobars are of the same element
• B. Isotopes have the same mass, isobars have different masses
• C. Isotopes are of the same element, isobars are of different elements
• D. Isotopes are of different elements, isobars have the same atomic number