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

Correct Sentence Order: 3-1-4-2 

Sentence 3 presents the problem — that valuable materials in e-waste are not being effectively reused. This sets the context for the discussion.

Sentence 1 introduces Veena Sahajwalla and her original solution to the problem stated in Sentence 3. It must follow Sentence 3 to establish the connection properly.

Sentence 4 elaborates on Sahajwalla's strategy — the idea of building microfactories to recover valuable materials from e-waste. This directly builds on the claim made in Sentence 1.

Sentence 2 adds more detail by describing the use of drones and robots in this recovery process, extending the concept from Sentence 4.

Also, Sentences 1, 2, and 4 use pronouns like "she" and "her", which clearly refer to Sahajwalla introduced in Sentence 1. This further confirms the order must be 3 → 1 → 4 → 2.

Final Order: 3 → 1 → 4 → 2

Correct Option: (D)