The following paragraph is from an essay about the history of technology.
[1] In 1948, Bernard Silver, a graduate student at Drexel Institute of Technology, overheard a supermarket executive asking a dean to develop a system to automatically capture product information at checkout. [2] Silver mentioned this challenge to his friend Norman Joseph Woodland, who became obsessed with the problem. [3] Woodland's initial idea was to use ink that glowed under ultraviolet light. [4] He then realized that a pattern of thin and thick lines, inspired by Morse code, could represent numbers.
The writer wants to add the following sentence to the paragraph:
"This ultraviolet ink, however, proved to be both unstable and expensive, forcing them to abandon the concept."
To make the paragraph most logical, where should this sentence be placed?
- Aafter Sentence 1
- Bafter Sentence 2
- after Sentence 3Cevap
- Dafter Sentence 4