Verbal Aptitude

Premises: 'All combine harvesters require diesel fuel. No machine that requires diesel fuel produces zero exhaust emissions.' If these statements are true, which of the following MUST also be true?

Options:

• (A) No combine harvester produces zero exhaust emissions.
• (B) All machines that produce emissions are combine harvesters.
• (C) Electric tractors require diesel fuel.
• (D) Some combine harvesters produce zero emissions.