Final answer:
The first phase of industrialisation began in the 1800s during the Industrial Revolution, which started in the 1750s and ran through the 1850s, making option a) 1800s the correct answer.
Step-by-step explanation:
The first phase of industrialisation began during what is known as the Industrial Revolution, which started in the latter half of the 18th century and continued into the 19th century. This transformative period in history is marked by a series of improvements in industrial technology that drastically changed the process of manufacturing goods.
The correct timestamp that marks the beginning of the first phase of industrialisation is the 1800s, specifically from 1750 to 1850. During this time, the United Kingdom initially led the way in industrial manufacturing; however, by the end of the 1800s, the United States had emerged as the major industrial power globally.
Thus, considering this information, the answer to the question 'Date 1er phase d'industrialisation' would be a) 1800s.