Final answer:
Option (1), A primary goal of the French in their expansion into Asia was to spread Christianity. Additionally, they were driven by the desire to establish trade and create infrastructure as part of their broader colonial ambitions.
Step-by-step explanation:
A goal of French expansion into Asia, particularly in relation to Vietnam, Laos, and Cambodia, was spreading Christianity. This objective was part of a larger imperialistic agenda commonly referred to as the civilizing mission. Alongside spreading Christianity, other key motivations included establishing trade with new regions and creating infrastructures such as roads and telegraph lines.
The French intervention in Indochina began under Napoleon III as a response to protect missionaries and eventually led to establishing control over the region. France's interests in Asia were largely influenced by competition with other European powers for colonies and their resources, the desire for new markets, and religious zeal.