The correct answer is option 1 which suggests that both assertion (A) and reason (R) are true and R correctly explains A.

In this case, the assertion (A) is that the emphasis of Jainism on non-violence deterred agriculturists from adopting Jainism. This is because, Jainism strongly advocates the principle of non-violence, or `ahimsa`, extending it not only to humans but also to animals and insects, a sentiment that could make it difficult for farmers to reconcile with.

The reason (R) is that cultivation involves killing insects and pests, which is undeniably true. In order to protect crops and ensure a reliable yield, farmers frequently have to employ measures to deter or kill pests, a practice that explicitly goes against the teachings of Jainism.

By this logic, R provides an appropriate explanation for A, as the requirement of killing insects and pests in agriculture contradicts the central tenets of Jainism, thus explaining why agriculturalists might be hesitant to embrace this religion. Therefore, option-1 is the accurate response.