The elderly mother sits in the armchair, at the family picture on the wall quietly.
A. staring
B. being stared
C. stared
D. to stare
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(答案→)A. staring
B. being stared
C. stared
D. to stare
解析：考察分词作状语。本句指的动词短语stare at与句子主语the elderly mother构成主动关系，使用现在分词在句中作状语。句意：老妈们坐在椅子上，安静地盯着墙上的全家福看。故A正确。