To determine the next image in the series, we need to identify the pattern or sequence in the given images:

1. Observe that each image consists of a triangle, a square, and multiple lines.
2. The position of the triangle and square alternates between the corners in a specific manner.
3. The number of vertical lines increases progressively from left to right in the series.

Following the observed pattern:

• The triangle and square alternate positions after each image. In the last image, the square is at the top left and the triangle at the top right.
• The next image in the series should have these positions: triangle at the top left and square at the top right.
• The number of lines continues increasing. Hence, the fifth image should have more lines than the fourth image.

Based on these observations, option 1 is the correct choice, as it follows the pattern of the previous images with the correct positioning of the triangle and square and an increased number of lines.