The correct answer is: B) Pali inscriptions.
Pali inscriptions are the most evident evidence of the influence of Buddhism in Kerala. These inscriptions are found on rocks, pillars, and other objects, and they record the names of Buddhist monks, temples, and other religious institutions. They also provide information about the history of Buddhism in Kerala.
Temple architecture is also evidence of the influence of Buddhism in Kerala. However, it is not as clear-cut as the evidence from Pali inscriptions. This is because many of the temples in Kerala were built after Buddhism had declined in the region. As a result, it is difficult to say for certain whether these temples were originally Buddhist or Hindu.
Rock edicts and cave paintings are also evidence of the influence of Buddhism in Kerala. However, they are much less common than Pali inscriptions. As a result, they provide less information about the history of Buddhism in Kerala.
In conclusion, the most evident evidence of the influence of Buddhism in Kerala is from Pali inscriptions. These inscriptions provide information about the history of Buddhism in Kerala, and they are the most reliable source of information about this topic.