Simple concept but you nailed it in the head here for me. ThanksRed Blood Cells depend exclusively on anaerobic glycolysis to produce energy (i.e. they have no mitochondria), irrespective of what the conditions are (glucose sufficiency after a meal or glucose depletion during fasting). Thus answer B is correct and answers A & E are not correct.
On the contrary, neurons may also use ketoacids as fuel, but this is not the case here (answers C & D are incorrect, although they seem very tempting).