Five jumbled sentences (labelled 1, 2, 3, 4, and 5), related to a topic, are given below. Four of them can be put together to form a coherent paragraph. Identify the odd sentence out and key in the number of that sentence as your answer.
- Photographic studios in the eighteen sixties usually charged by the plate and sold the finished portraits in sets of a dozen.
- Studios propped heads against iron stands and told sitters to fix their eyes on a spot on the wall.
- People in early photographic portraits look solemn, and the usual explanation is that life was harder then.
- What we read as the mood of a whole century is really the mark of a long exposure.
- The real reason is duller: a sitter had to hold still for many seconds, and a smile cannot be held that long without collapsing.