The table below shows the cost per pound of different vegetables.

To find the estimated cost for 4.5 pounds of cucumbers, you can multiply the cost per pound of cucumbers by the number of pounds.

The cost per pound of cucumbers is $2.59.

So, the calculation would be:

\[
4.5 \, \text{pounds} \times 2.59 \, \text{dollars/pound} = 11.655 \, \text{dollars}
\]

Rounding to the nearest whole number, the estimated cost is approximately $12.

Since none of the given options match the calculated result, it seems that the closest reasonable estimate from the provided choices would be **$10**. However, none are accurate; the exact answer is not listed among the options.