In the argument against the dog ban, the author writes, "the beach is an ideal open space for dogs to run freely, unencumbered by leashes." as used by the author, which of the following also describes something that is unencumbered?

go on dog ban: for and against

a. after the traveller freed the horse from the buggy, the horse galloped around the open field

b. once it was let out of the crate, the dog ran circles around the dining room.

c. after it was released into the wild, the panther that grew up in a zoo stayed in one small area.

d. as the hiker became more used to the weight of her pack, she noticed it less frequently.