The correct option is D weak monobasic acid
Boric acid is a weak, monobasic lewis of boron often used as an antiseptic, insecticide, flame retardant, neutron absorber or precursor to other chemical compounds. It has the chemical formula,H3BO3 (sometimes written B(OH)3 and exists in the form of colourless crystals or a white powder that dissolves in water.