Correct Option (A)
Assumption 1 is valid. The passage states that "Climate -energy models project that biomass use could increase nearly four-fold to around 150- 200 exajoules, almost a quarter Of world primary energy in 2050." It further notes that "some climate models rely on biomass-based carbon capture and storage, an unproven technology, to achieve negative emissions and to buy some time during the first half of the century." These references indicate that certain climate-energy models consider biomass as a component in strategies for mitigating greenhouse gas emissions.
Incorrect Options:
Assumption 2 is invalid. The passage explicitly mentions "the maximum sustainable technical potential of biomass resources (both residues and energy crops) without disruption of food and forest resources ranges from 80- 170 exajoules a year by 2050, and only part of this is realistically and economically feasible." This statement directly contradicts the assumption that it is impossible to use biomass as a fuel for power generation without disrupting food and forest resources, by indicating a sustainable potential that avoids such disruption.