You need go no further than A.
Sin(Angle) / Opposite Side = Side another Angle / Side Opposite this angle.
The angles and sides share the same letter. The angles are labeled with Capital letters. The sides are labeled with lower case letters.
The Sides in this law are included within the arms of the angle.
B won't work. It will find x
C and D won't work. 2.6 is one of the arms making up the angle marked 76
