Step 1: Concept
In embedded figure questions we look for the key features of the given shape, then test each option for those features. Here the key features are a left-pointing triangle, a vertical side and one extended slanted line.
Step 2: Key features
Feature 1: a vertex on the left where two slanted lines meet. Feature 2: a vertical line closing the triangle on the right. Feature 3: one slanted line runs on beyond the vertical line.
Step 3: Eliminate by feature 1
Options 2 and 3 do not have two slanted lines meeting at a left vertex with a closing vertical line, so they fail.
Step 4: Eliminate by feature 2
In option 1 both slanted lines stop at the corners together with the right edge, and the closing line is a horizontal line, not a vertical one. Features 2 and 3 are not met, so option 1 fails.
Step 5: Confirm option 4
Option 4 has crossing diagonals meeting at the centre, a vertical line at the right side closing the triangle and the upper diagonal running on past it. All three features are met.
Final Answer:
Option 4 contains the figure.
\[ \boxed{\text{Option 4}} \]
