Option 1 states that India is the third largest in the world in the manufacture of silicon wafers used in photovoltaic units. However, this is incorrect. China is the largest producer of silicon wafers, with India not among the top three.

Option 2 asserts that the solar power tariffs are determined by the Solar Energy Corporation of India. This is also false. The Central Electricity Regulatory Commission (CERC) in India is the body mainly responsible for determining the tariffs for power in the country, including solar power, not the Solar Energy Corporation of India.

Thus, neither statement 1 nor 2 is correct, making Option 4 the correct answer. It`s critical for students to have a strong understanding of production strengths on a global scale, and the roles and responsibilities of energy corporations and regulatory bodies in India, to effectively evaluate these types of statements.