When would you be more likely to use Ocean transportation instead of Air transportation? Note that upon submission, if some points have been awarded, all options selected will be marked as green (even the wrong ones). If no points have been awarded, all options selected will be marked as red (even the right ones). A message indicating "correct", "partially correct" or "incorrect" will appear below the question. We know this can be confusing and are working with edX software engineers on this issue