Question

The four sentences (labelled 1, 2, 3 and 4) given below, when properly sequenced, would yield a coherent paragraph. Decide on the proper sequencing of the order of the sentences and key in the sequence of the four numbers as your answer.
1. Veena Sahajwalla, a materials scientist at the University of New South Wales, believes there is a new way of solving this problem.
2. Her vision is for automated drones and robots to pick out components, put them into a small furnace and smelt them at specific temperatures to extract the metals one by one before they are sent off to manufacturers for reuse.
3. E-waste contains huge quantities of valuable metals, ceramics and plastics that could be salvaged and recycled, although currently not enough of it is.
4. She plans to build micro factories that can tease apart the tangle of materials in mobile phones, computers and other e-waste.

• A. 4132
• B. 1432
• C. 2431
• D. 3142

Answer 1

The Correct Option is D

She claims in the first sentence to have an original solution to the issue. Sentence 4 elaborates on Sahajwalla's strategy, saying that she wants to construct microfactories in order to recover valuable materials from electronic waste. Sentence 4 must thus come after Sentence 1. Sentence 2 explains how autonomous drones and robots will be used in the process of collecting metals from e-waste, logically building on Sentence 4 and painting a clear and comprehensive picture of the suggested solution.
Sentence 3 presents the problem by emphasizing that valuable materials found in e-waste are not being repurposed effectively. The conversation that follows is contextualized by this.
Sentences 2 and 4 now include reference to a "She" and a "Her," as can be seen if we look at Sentences 1, 2, and 4.
They can only be referring to Veena Sahajwalla in the context of these three sentences. Sentence 1 therefore needs to come after Sentence 3. 

The correct option is (D): 3142.