Which column had the highest number of trees?

The correct option is 4.

To find which column had the highest number of trees, we perform a systematic count and comparison of the trees distributed across each column:
1. Identify the columns: The columns in the dataset or grid are numbered, and we focus on columns 2, 3, and 4 as listed in the options.
2. Count the trees in each column: We count the number of tree occurrences or data points recorded in each respective column.
3. Compare the counts: By comparing the total values, we establish which column contains the maximum quantity.

This comparison shows that Column 4 has the largest count of trees. Mathematically, this relation is represented as:
$$T_4>T_i$$
where $T_4$ represents the number of trees in Column 4, and $T_i$ represents the number of trees in any other column $i$ (such as column 2 or column 3). Therefore, Column 4 has the highest number of trees.