What country was the first to be introduced to Christianity in West Africa?

Sierra Leone was the first country to be introduced to Christianity in West Africa. The introduction of Christianity to Sierra Leone dates back to the late 18th century when a British abolitionist named Granville Sharp, along with a group of freed slaves, founded the Province of Freedom, which later became Freetown, the capital city of Sierra Leone. The group included both Christians and Muslims, but Christianity was the dominant religion. In 1792, the first Anglican mission was established in Freetown, which marked the beginning of the spread of Christianity in Sierra Leone and West Africa as a whole. Therefore, out of the options given, the correct answer is "Sierra Leone."