Correct Option (B)
Assumption 2 is valid. The passage explicitly states, "Yet the creative use of leisure by a minority in societies has been the mainspring of all human progress beyond the primitive level." This directly supports the inference that the utilization of leisure by certain individuals for innovative endeavors has been a principal catalyst for human progress.
Incorrect Options:
Assumption 1 is not valid. The passage indicates, "The gift of leisure may be abused by people who have had no experience of making use of it." This statement contradicts the premise that individuals consistently perceive leisure as a gift and invariably employ it for the acquisition of material possessions. Furthermore, the passage contrasts the accumulation of material possessions with the enjoyment of leisure, implying that leisure's primary benefit is not linked to material acquisition.