[单选题]
A farsighted person can read a newspw 2g+ (svm grq( 0;gyr,lnls;gaper held 2p yi:jhl4 (tr*5 cm from his eyes, if he wears glass i:tphr4l*j y(es of +3.33 diopters. What is this person's near point?
A. $4.2 \; cm$
B. $25 \; cm$
C. $31 \; cm$
D. $1.5 \; m$