Consider (1), (2), (3) and (4) and then select the correct answer. With reference to Descartes.
1. Truths of sciences can be doubted.
2. Sense-testimony can be doubted.
3. Nothing except the self can be doubted.
4. Act of doubting cannot be doubted.

A. 1 and 2 are only correct

B. 1, 2 and 3 are only correct

C. 1, 2 and 4 are only correct

D. 2, 3 and 4 are only correct

Answer: Option C