How would you classify the paragraph in terms of structural organisation?

Which of the following sentences best combines the following simple sentences into a grammatical and meaningful sentence:

Original sentences:

• Recently, a study reported the feasibility of RWH systems for producing drinking water in the Netherlands (Hofman-Caris et al., 2019). 
• They found that the system was beneficial for cities, but not for rural areas.

Read the following paragraph and match each study with its main finding.

Paragraph:

Studies on rainwater harvesting (RWH) for drinking water supply in rural areas are limited. García Soler et al. (2018) studied around 200 RWH projects in Berlin, Germany to understand why this technology had not been widely adopted as it is supposed to be. They found that the RWH system did not succeed because much attention had been given to city areas where they already had a centralised system. Recently, a study reported the feasibility of RWH systems for producing drinking water in the Netherlands (Hofman-Caris et al., 2019). They found that the system was beneficial for cities, but not for rural areas. The authors considered a sophisticated and robust water treatment system in their analysis, which was not affordable for rural areas. Al-Batsh et al. (2019) examined the quality of harvested rainwater in Yatta, Palestine and found that the water met all the local standards of drinking water except microbial contamination. They suggested that the installation of a simple filtration system should be able to make the harvested rainwater drinkable. It was also reported that the RWH system was economically feasible. Based on the above literature review, it appears that the feasibility of a RWH system differs from place to place depending on a number of factors, such as local climate pattern, material cost and availability, labour cost and water treatment method.

Taken from this source: https://www.sciencedirect.com/science/article/pii/S0959652620324847?ref=pdf_download&fr=RR-2&rr=99a218ddc91829a1 

In the phrase “feeling that one belongs in a social milieu”, what does the word "milieu" imply in this academic context?

Choose the best paraphrase of the following sentence:

In the context of the excerpt, what does the key word "conceptualisations" most closely mean?

Choose the sentence that most clearly and formally expresses the following idea:

In the context of the passage, what is the closest meaning of the word "meticulous" as used in the sentence:

What does the term "amalgamation" imply in this context?