Final answer:
Metal sulfides are best matched with hydrogenous sediment, which is formed from minerals that precipitate from water due to chemical reactions. So, the correct answer is option d.
Step-by-step explanation:
Matching the term 'metal sulfides' with the appropriate phrase, it would be best associated with D. hydrogenous sediment. Hydrogenous sediments are formed from minerals that precipitate directly from water due to various chemical reactions. These can include metals such as manganese, copper, or, in this case, metal sulfides like pyrite (FeS2), forming in oceanic or freshwater environments. So, the correct answer is option d.