For Each of the Following Sentences, Select the Best Translation

Multiple Choice

For each of the following sentences, select the best translation into predicate logic, using the given constants and predicates.
-Some yellow birds both chirp and sing.

A) (∃x) [(Yx • Bx) • (Cx • Sx) ]
B) (∃x) (Yx • Bx) • Sx
C) (∃x) (Sx • Bx) • Yx
D) (∃x) [(Yx • Bx) ⊃ (Cx • Sx) ]
E) (∃x) [(Yx • Bx) ⊃ (Cx ⊃ Sx) ]