Correct Option (B)
Assumption II is valid. The passage states that "As societies become wealthier, their consumption of animal products increases." It further explains that a "greater proportion of such basic foodstuff as grains and legumes that could feed humans directly is instead being converted into feed for poultry and large farm animals." This process is described as inefficient, with significant caloric losses (e.g., only 16% recovered from chickens, 5-7% from large animals). This directly supports the assumption that wealthier societies tend to incur great loss of calories of food materials due to indirect utilization of their agricultural produce.
Incorrect Options:
Assumption I is not valid. The passage discusses patterns of food production, utilization, and consumption in relation to wealth and animal product consumption. It does not mention food manufacturing and processing industries, nor does it suggest that these industries should align their objectives with changing societal needs. This assumption introduces information and a prescriptive statement that is beyond the scope and direct implication of the provided text.