How many triangles are there in the given figure? 
To count the number of triangles in the figure, we break down the structure and carefully count the distinct triangles formed by the lines:
1. Count the individual small triangles.
2. Count the larger triangles formed by combining smaller triangles.
3. Sum all distinct triangles. After carefully analyzing the given figure, we find that the total number of triangles is 31.
Thus, the correct answer is Option C.

Statement: All flowers are beautiful. Some beautiful things are fragile.
Conclusion I: Some flowers are fragile.
Conclusion II: All beautiful things are flowers.
For the reaction \( A + B \to C \), the rate law is found to be \( \text{rate} = k[A]^2[B] \). If the concentration of \( A \) is doubled and \( B \) is halved, by what factor does the rate change?