Health in panama improved as a result of construction of the panama canal because doctors protected laborers by a) working to eliminate tropical diseases. b) demanding medical education be available. c) insisting on more healthcare funding. d) working to improve drinking water.

a) working to eliminate tropical diseases.

Explanation:

Tropical diseases in Panama prior to the construction of the Panama Canal were a severe cause of labor shortage, since tropical diseases doesn´t really kill you but rather weaken you to a point where no activity is possible, the focus of the doctors was to erradicate this diseases often transmited by the mosquitos that thrive on tropical zones, they protected the laborers by helping them stop the spread of those diseases and treating who already had them.

you didn't give any answers to choose from so i can't with this but, i do know something that the mexican government would be worried about and that is the wall that donald trump is currently trying to get up.