C because it gives the vibe of the paragraph and extra description
2nd choice because it really isn't technically a abbreviation so p. or any other wouldn't work.
1 is a for sure brutal means hard and bad
2 is c feedable means meh and ok amor bad
3 is b it is a mixture of metals search it up!!
4 is b it dosent stay in the same place that’s what stationary means you can also search that up!
and lastly 5 is b i think because it makes sense for horses and if you search it up something pops up as stable but i cannot assure you of that! happy to help!!