DIRECTIONS for the question: The following question consists of six statements (A, B, C, D, E and F) followed by options consisting of three statements put together in a specific order.
Choose the option which indicates a valid argument containing logically related statements that is, where the third statement is a conclusion drawn from the preceding two statements.
A. An ostrich lays eggs.
B. All birds lay eggs.
C. Some birds can fly.
D. An ostrich can not fly.
E. An ostrich is a bird.
F. An ostrich can not swim

DEC (Option A): Knowing an ostrich cannot fly (D) and is a bird (E) doesn't prove that some birds can fly (C); it only proves that some birds cannot fly.

BEA (Option B): If all birds lay eggs (B) and an ostrich is a bird (E), it logically follows that an ostrich lays eggs (A).

ABE (Option C): Knowing an ostrich lays eggs (A) and all birds lay eggs (B) does not prove an ostrich is a bird (E), as other non-bird animals (like reptiles) also lay eggs.

ECB (Option D): Knowing an ostrich is a bird (E) and some birds can fly (C) provides no logical basis to conclude that all birds lay eggs (B).

DEF (Option E): Knowing an ostrich cannot fly (D) and is a bird (E) has no logical connection to whether or not an ostrich can swim (F).

Thus, the answer is Option B.