The term ‘general authorities‘ is used once in the D&C. It wasn’t in a revelation. It is from the “Minutes of the organization of the first high council of the Church, at Kirtland, Ohio, February 17, 1834.”
Here is the reference with some context:
“The high priests, when abroad, have power to call and organize a council after the manner of the foregoing, to settle difficulties, when the parties or either of them shall request it. And the said council of high priests shall have power to appoint one of their own number to preside over such council for the time being. It shall be the duty of said council to transmit, immediately, a copy of their proceedings, with a full statement of the testimony accompanying their decision, to the high council of the seat of the First Presidency of the Church. Should the parties or either of them be dissatisfied with the decision of said council, they may appeal to the high council of the seat of the First Presidency of the Church, and have a re-hearing, which case shall there be conducted, according to the former pattern written, as though no such decision had been made.
“This council of high priests abroad is only to be called on the most difficult cases of church matters; and no common or ordinary case is to be sufficient to call such council. The traveling or located high priests abroad have power to say whether it is necessary to call such a council or not. There is a distinction between the high council or traveling high priests abroad, and the traveling high council composed of the twelve apostles, in their decisions. From the decision of the former there can be an appeal; but from the decision of the latter there cannot. The latter can only be called in question by the general authorities of the church in case of transgression.
“Resolved: that the president or presidents of the seat of the First Presidency of the Church shall have power to determine whether any such case, as may be appealed, is justly entitled to a re-hearing, after examining the appeal and the evidences and statements accompanying it.” (D&C 102:24-33)
It is clear the ‘general authorities of the church’ does not refer to 12 apostles. It seems in my reading the ‘general authorities’ are the first presidency and perhaps the presiding high council (not extant).