I think the optional extras packs are poorly described & explained.
(no cost option) Interior motion sensors are a standard part of the alarm system & can be switched off if you want to.
As above, Parktronic beeps(from the front & rear as appropriate) & has front & rear displays which visually indicate how close you are. It is fully integrated with the car gearbox & speed sensors. It comes on when driving slower than 15mph(I think) & in reverse.
Light & sight pack- I think this will be the same as 'Interior light package' which gives illuminated vanity mirrors in front, map reading lights in the rear, footwell lights in front & 'puddle lights' in the front doors.
Comfort pack gives front seat adjustable lumbar support & adj seat cushion angle, plus adds seat height adjustment to passenger seat.
(no cost option) Non smoker pack replaces the cigarette lighter sockets with accessory sockets & replaces ashtray with storage compartment; plus gives improved cabin air ambiance & smell
IF these are the only options on the car you are looking at, then it is not exactly fully loaded & if you look around a bit you should be able to get one with more 'toys' on, such as comand, luxury climate, sunroof, Harmon Karmon surround sound, CD changer, heated seats, leather etc
Active Park assist is an optional extra on the facelift model only
Let us know how you get on!
PS the B class is also known as W245 - Mercedes nomenclature!