There is a sentence that is missing in the paragraph below. Look at the paragraph and decide where (option $1, 2, 3$, or $4$) the following sentence would best fit.
Sentence: And probably much earlier, moving the documentation for kissing back $1,000$ years compared to what was acknowledged in the scientific community.
Paragraph: Research has hypothesised that the earliest evidence of human lip kissing originated in a very specific geographical location in South Asia $3,500$ years ago. From there it may have spread to other regions, simultaneously accelerating the spread of the herpes simplex virus __$(1)$__. According to Dr Troels Pank Arbøll and Dr Sophie Lund Rasmussen, who in a new article in the journal Science draw on a range of written sources from the earliest Mesopotamian societies, kissing was already a well-established practice $4,500$ years ago in the Middle East. __$(2)$___. In ancient Mesopotamia, people wrote in cuneiform script on clay tablets. __$(3)$____. Many thousands of these clay tablets have survived to this day, and they contain clear examples that kissing was considered a part of romantic intimacy in ancient times. __$(4)$___. "Kissing could also have been part of friendships and family members' relations," says Dr Troels Pank Arbøll, an expert on the history of medicine in Mesopotamia.
- Option $1$
- Option $4$
- Option $3$
- Option $2$