Answer: Make connections between the sources
Explanation: According to the dictionary, Synthesis is defined by the combining of the constituent elements of separate material or abstract entities into a single or unified entity, the separating of any material or abstract entity into its constituent elements, i.e., synthesis is a gathering of information from different sources with a goal of producing a written discussion to reach a conclusion.
In literature review, which is done in researches, through various source materials, you make connections with each other, creating a view of the subject relevant to the your research.
So, in the beginning of your synthesis. it is better to connect all the information you gathered, put them in order and then write your synthesis.