Which of the following is a stronger acid than benzoic acid because of the ortho effect?

Almost any ortho substituent forces the $\mathrm{COOH}$ group out of the plane of the ring and makes the acid stronger than benzoic acid (pKa 4.20). 2-Methylbenzoic acid has pKa 3.91. The para-methyl, para-methoxy and para-amino acids are weaker than benzoic acid because these groups donate electrons.