I use Memorial Acclamation "A" because it translates more closely to the meaning of Mortem Tuam.
I'm not sure why one would have a preference for one over the other.
The thinking in 1969 was:
Thank the Lord Pope Benedict demanded accurate translations.
Actually Liturgiam authenticam was promulgated during the pontificate of St. John Paul II. Don't blame it on Pope Benedict.
Benedict did insist on pro multis being rendered as “for the many” himself...
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