There are 3 shapes on a 4x4 grid. Which shape is closest to the green rectangle in terms of Manhattan distance? The final answer is the grid position of the closest shape like (row_index, column_index).
<think>Target shape: green rectangle at (3, 0)
Distance from target shape to purple trapezoid at (2, 1): 2
Distance from target shape to pink right_triangle at (2, 0): 1
Closest shape is the pink right_triangle at (2, 0) with distance 1</think>

<answer>(2, 0)</answer>