Mandi, a florist at Green Thumb nursery, takes an artificial ficus tree home from the store permanently and without the owner's permission. Mandi is liable for conversion

$q,$ a$.$ only if she fails to prevent a theft of the tree from her possession.

$$ b$.$ only if she damages the tree.

c$.$ under any circumstances.

d$.$ only if she attempts to sell the tree to a third party.