please explain

Assume that transaction f14a is a valid transaction and in that transaction, A has been given 25 bitcoins. Given the following pool of unconfirmed transactions: 7888 Inputs: af522) Outputs: C(B), D(2) 81, A(10.5) Inputs: e4a4(2) Outputs: E(0.5) Inputs: bd7d(2) Outputs: AlO.5). E(o.S). FIO.S). 014) Signed (A)Signed (F) Signed (D) a14f 5ce6 Inputs Outputs: F(25) Inputs: e4a4(2) Outputs: F(0.5) Inputs: f14a(1) Outputs: 8(8), A(17) Signed (F) Signed (F) Signed (A) e4a4 7ac8 bd7d Inputs: f3cdf1) Outputs: D(O.5), F(1), C(1.5) Inputs: bd7d(1) Outputs: A(O.S), E(0.4) Inputs: af52(1) Outputs: C(1) D(3)E(3).8(1) Signed (C) Signed (B) Signed (B) Which pair forms the double-spending transaction? O f3cd and 3ba5 e4a4 and Sce6 e434 and 3bas 3ba5 and sce