The correct option is "1 and 2 only" because the Brahmo Samaj, founded by Raja Ram Mohan Roy in the early 19th century, aimed to reform Hindu society by opposing practices such as idolatry (Statement 1), advocating for a rational understanding of religion, and emphasizing direct relationship with the divine without the need for intermediaries, thus denying the necessity of a priestly class (Statement 2). However, it did not popularize the notion that the Vedas are infallible; rather, it encouraged a critical approach towards religious texts, which reflects a more reformist and rational perspective rather than a dogmatic one (Statement 3). This understanding aligns with the historical context of socio-religious reform movements during the period and their contribution to the modern interpretation of Indian spirituality.