Ihave a new hobby.
i keep track of all the wild birds i spot.
which sentence uses parenthetical elements most effectively to combine the information in the sentences?
i have a new hobby, which is keeping track of all the wild birds i spot.
i have a (new) hobby, which is keeping track—of all the (wild) birds i spot.
i have a new hobby, keeping track—of all the wild birds i spot.
i have a new hobby—keeping track—of all the (wild) birds (i spot).