The final choice. the blessings in which "you" rejoice aren't enjoyed in "common"
you is a specific subject so common and you here are meant to be opposites, common being a general subject (all people). they're set against each other as subjects
The answer is D: <em>shared alike by all persons in question</em>.
The speaker is explaining to the listeners/readers that that they are priviledged for the fact that they received blessings, in which they rejoice. He goes on to say that despite their being blessed and having all resons to be glad,<em> this is not shared by some, who don't show gratitude by rejoicing for the blessings.</em>
