A rule of thumb for constructing girder pockets is that the pocket should be at least __ wider than the girder and the girder must have at least __ of bearing on the wall A. 2'',5'' B. 1'',4'' C. 2'',4'' D. 3'':5''

The rule of thumb for constructing girder pockets is that the pocket should be at least \( 2^{\prime \prime} \) wider than the girder and the girder must have at least \( 4^{\prime \prime} \) of bearing on the wall. Therefore, the correct answer is:<br /><br />C. \( 2^{\prime \prime} ; 4^{\prime \prime} \)