Step 1: Understanding the Question
The given figure is a small triangle with one long line that continues beyond the triangle. One side of the triangle is vertical, and the other two sides meet at a point on the left. We must find the option where this exact shape is hidden.
Step 2: Describe the given figure
The triangle points to the left. Its right side is vertical. The upper slanted side is extended beyond the vertical side towards the upper right.
Step 3: Check option 1
The right part has a horizontal line from the centre to the right edge. Its diagonals end exactly at the corners, so no diagonal goes past a vertical side. There is no triangle with a vertical side and an extended slanted side. So option 1 is wrong.
Step 4: Check option 2
This has one long rising diagonal, a horizontal line and a vertical line crossing at the middle. No left pointing triangle with a vertical side is formed. So option 2 is wrong.
Step 5: Check option 3
Here only a small slanting stroke crosses the middle of a plus sign. It is too short to make the given triangle. So option 3 is wrong.
Step 6: Check option 4
The two diagonals cross at the centre. The vertical line on the right cuts both diagonals. The centre and the two cut points form a triangle that points left with a vertical right side. The upper diagonal continues past the vertical line to the corner, which is the extended line in the given figure. So option 4 is correct.
Final Answer:
The given figure is hidden in option 4.
\[ \boxed{\text{Option 4}} \]
