Kelly is planning to add a garden to her backyard. The garden will be partitioned into rectangular blocks so that \(3l+w=16,\) where l is the length and w is the width of each block, in feet. The lengths of all the blocks will be the same, and similarly for the widths.

Kelly decides that she would like the total length of the garden to be 34 feet, with the length of each block between 3 and 4 feet. She also wants there to be 2 rows of blocks with an even number of blocks in each row. Which of the following must be the width of each block, in feet?