A. Batchelder Avenue is a one-way street.
Contradicts the deduction: if it were one-way, it would have a bike lane, but we've deduced it doesn’t.
C. Parking is allowed on Batchelder Avenue.
Could be true, but not guaranteed: the premises tell us parking may be allowed if there’s no bike lane, but they don’t guarantee that every street without a bike lane allows parking.
D. Parking is not allowed on Batchelder Avenue.
Opposite of C: equally possible but not forced. No premise demands prohibition of parking on streets without bike lanes.
E. Parking is not allowed on any street on which buses do not travel.
Overreaches: the premises don’t link “no bus traffic” universally to “no parking.” Some streets might have no buses but no bike lanes, allowing parking.
Thus B is the only choice that must be true given all premises
(1) Every one-way street has a dedicated bike lane.
(2) Buses do not travel on streets that have a dedicated bike lane.
(3) Bus #9 travels the full length of Batchelder Avenue.
From (2) + (3): Batchelder cannot have a dedicated bike lane (because a bus would not go on a street with a bike lane).
By using the contrapositive of (1): If a street does not have a dedicated bike lane, then it is not a one-way street.
Since Batchelder has no bike lane, it must not be one-way.