We have Law of Cosines for a and then for the two angles, really only one angle because they'll add to 180 degrees.
b=9, c=11, A=56°
a² = b² + c² - 2bc cos A
a² = 9² + 11² - 2(9)(11) cos(56) ≈ 91.2798
a ≈ 9.554
b² = a² + c² - 2ac cos B
2ac cos B = a² +c² - b²
cos B = (a² +c² - b²) / 2ac
cos B ≈ (91.2798 + 11² - 9²) / 2(9.554)(11) ≈ 0.62458
B ≈ arccos 0.62458 ≈51.348 degrees
Looking at the choices we don't need to bother with C,
Answer: A a=9.6, B=51.4 deg
