1. बहुत समझाया कि यह काम मत करो, पर उसके कानों पर नहीड)
2. धन-संपत्ति के लालच में भाई भी एक दूसरे के
3. चिटफंड कंपनी बनाकर राजेश ने लाखों रुपये का है।
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गाँसी गई।

in the following paragraph, the fourth sentence the correct answer is: three personal subject pronouns

”she was embarrassed when she found that they had been put back on the shelves…”

a   subject pronoun is a personal pronoun. i, you, he, she it, we, they.  

in the sentence it can be observed she, used twice and they used once. is for this reason that is a three personal subject pronoun sentence.