Question Statement:
Read the passage and answer the question:
"Renewable bioenergy systems often face an energy return on investment (EROI) paradox. While sugarcane bioethanol delivers an EROI exceeding $8:1$, corn-based ethanol exhibits an EROI marginally above unity ($1.2:1$ to $1.5:1$) when energy inputs from tractor diesel, nitrogen synthesis, distillation steam, and transport logistics are comprehensively accounted for. Thus, life-cycle carbon neutrality cannot be assumed merely by virtue of biological feedstock origin."
The author's primary argument in the passage is that:
Options:
- (A) All biological feedstocks provide equal thermodynamic advantages over fossil fuels.
- (B) Biofuel sustainability must be assessed through comprehensive life-cycle energy accounting rather than assumed origin.
- (C) Sugarcane bioethanol is thermodynamically unsustainable due to high distillation energy requirements.
- (D) Corn ethanol should replace sugarcane bioethanol due to superior agricultural productivity.