Which solution would most likely cause a plant placed in it to become firmer and more rigid?

Hypotonic solution.

Explanation:

Hypotonic solution is defined as a solution which has lower solute concentration with comparison to another solution of a cell.

The plant cell is takes up water from the outside of the cell where high water concentration is present so water is moves in of the cell with the help of osmosis process and start to become swell, but with the help cell wall which is present on cell prevents it from bursting when the plant cell is present in this solution (hypotonic solution).

So, if the plant cell is placed in a hypotonic solution it to become firmer and more rigid.

the framers of the constitution insisted that federal judges be nominated instead of elected due to their desire to have judges above the shifting whims of the masses.

the hope, whether achieved or not, was that federal judges would only be beholden to the law and that by not having judges be elected, they would be protected if that law dictated an outcome that ran counter to popular opinion.