This problem is a good multiple-choice question about geometry, which is mainly solved according to the degree of each angle of a square ruler and the theorem of the sum of internal angles of triangles.

answer

Solution: ∫∠C = 30, ∠ DAE = 45, AE∨BC,

∴∠EAC=∠C=30，∠FAD=45-30= 15，

In △ △ADF, according to the theorem of triangle interior angle sum, we get: ∠ AFD =180-90-15 = 75.