The correct answer is option 1, which states that only statement 1 is correct.

Statement 1 is indeed correct. Karl Marx did put forward the theory of Scientific Socialism in the Communist Manifesto, which was published in 1848. This theory forms the basis of Marxist ideology and lays out the principles of socialism as advocated by Marx and Friedrich Engels.

However, statement 2 is not correct. According to the theory of Scientific Socialism, economic conditions do play a significant role in shaping human history. Marx argued that the economic system, specifically the mode of production and the class struggle, is the primary driver of historical development. In other words, the economic structure determines the social and political relationships within a society. Therefore, statement 2 is incorrect.

To summarize, while statement 1 is correct as Karl Marx did propose the theory of Scientific Socialism in the Communist Manifesto, statement 2 is incorrect as economic conditions are considered a key determinant of human history in this theory.