Emma and Jack are talking about their science projects.
Emma: I'm doing research on the discovery of penicillin. Alexander Fleming found it in 1928.
Jack: That's interesting! I'm working on the invention of the light bulb. Thomas Edison made it in 1879.
Emma: Both are important, but I think penicillin is more valuable because it saves lives.
Jack: I agree. However, without the light bulb, we couldn't work at night.
According to the conversation above, what can we infer about Emma and Jack?
A)They both think the light bulb is more important than penicillin.
B)They both think penicillin is more important than the light bulb.
C)They both think their own project topic is the only important one.
D)They both think their own project topic is important.