Final answer:
The British English term for a tractor and trailer together is an 'articulated lorry', which refers to the articulated nature of the vehicle allowing for sharp turns. The correct option is (b) Articulated lorry.
Step-by-step explanation:
In British English, when referring to a tractor and a trailer together, the term often used is articulated lorry. This term specifically denotes a vehicle consisting of a tractor unit attached to a semi-trailer to carry freight. A good analogy to understand this is by considering a semi-truck in American English, which has similar characteristics.
The semi-trailer attaches to the tractor with a type of hitch called a fifth wheel, allowing for a greater range of motion. This configuration makes the entire vehicle articulated, meaning it can turn more sharply than a single, rigid vehicle.
Other options such as van, truck, and caravan do not accurately describe the combination of a tractor and trailer.
A 'van' is typically a smaller enclosed vehicle, a 'truck' can refer to many types of larger vehicles but doesn't specify the trailer part, and a 'caravan' refers to a vehicle used for living in during travel, or a convoy of travelers. Hence, the correct option for the British term for a tractor and trailer together is 'articulated lorry'.