Which of the following acids are stronger than benzoic acid ($\mathrm{p}{K}_a$ 4.20)?

Ortho-substituted benzoic acids are stronger than benzoic acid regardless of the group (ortho effect): 2-methyl (3.91) and 2-chloro (2.94). The para-substituted acids with $+I$ or $+M$ groups are weaker: 4-methyl (4.37) and 4-methoxy (4.47).