Christian missionaries played a role in:

The correct answer is: d) All of the above.

Christian missionaries have played a significant role in spreading education, introducing healthcare, and influencing social change around the world.

• Spreading education: Christian missionaries have established schools and universities in many parts of the world, providing education to people who would not otherwise have had access to it. This has helped to improve literacy rates and promote economic development.
• Introducing healthcare: Christian missionaries have also established hospitals and clinics in many parts of the world, providing healthcare to people who would not otherwise have had access to it. This has helped to improve public health and reduce mortality rates.
• Influencing social change: Christian missionaries have also played a role in influencing social change in many parts of the world. For example, they have helped to promote the abolition of slavery, the emancipation of women, and the rights of indigenous peoples.

Overall, Christian missionaries have had a positive impact on the world through their work in education, healthcare, and social change.