Asoka did indeed send out missionaries to spread Buddhism, which is true. His conversion and subsequent efforts, including his son's missionary work in Sri Lanka, greatly contributed to the dissemination of Buddhism in Asia.
The statement that Asoka sent out missionaries to spread Buddhism is true. After the battle of Kalinga, Asoka experienced a profound change, leading to his conversion to Buddhism, a transformation marked by remorse and a shift towards non-violence and welfare of his subjects. To promote Buddhism, Asoka embarked on various activities; he deployed monks to spread Buddhist teachings across Asia, commissioned pillars enshrining Buddhist principles, built rest-houses and hospitals along roads, and replaced hunting expeditions with religious pilgrimages.
His efforts notably extended beyond India, as his own son is credited with being the first Buddhist missionary to Sri Lanka, therefore playing a pivotal role in propagating Buddhism from its Indian roots to a broader Asian context.
So, it is clear that Asoka's personal and political support was instrumental in the expansion of Buddhism during his reign, exemplifying the strong connection between royal patronage and the spread of religious ideologies during ancient times.