Final answer:
A glacier is the environmental setting most likely to produce poorly to moderately sorted sedimentary deposits with angular grains of feldspar, quartz, and lithics.
Step-by-step explanation:
The environment that would most likely produce sedimentary deposits characterized by poorly to moderately sorted, angular to subangular grains consisting of feldspar, quartz, and lithics (rock fragments) would be a glacier (B). Glaciers are known to leave behind sediment with variable grain sizes that are poorly sorted, as the ice movement does not allow for the extensive sorting of sediment. This type of sedimentary environment tends to be near the source of the rocks due to the fact that the geological processes, such as weathering and transport, are minimal compared to more distant environments like oceans. The grains, therefore, remain more angular and do not have as much opportunity to become rounded by physical abrasion.