To find the total number of straight lines in the given figure, we need to count both the horizontal, vertical, and diagonal lines separately and then sum them up.

Step-by-step Analysis:

1. Identify the horizontal lines. There are clearly 3 horizontal lines.
2. Identify the vertical lines. Observing the image, we count 3 vertical lines.
3. Count the diagonal lines. The figure contains 5 diagonal lines.

The total number of straight lines is the sum of horizontal, vertical, and diagonal lines:

\(3 + 3 + 5 = 11\)

The correct answer is 11.