All metals I      lose electrons II     react with oxygen III    are solid at room temperature AI only BI and II only CII and III only DI , II and III

The correct answer is D. I, II and III.

Explanation:

I. All metals lose electrons: This is true. Metals are known to be good conductors of electricity. This is because they have free electrons that can move around easily. When metals react with other substances, they tend to lose electrons and form positive ions. This is known as oxidation.

II. All metals react with oxygen: This is also true. When metals react with oxygen, they form metal oxides. This is a common reaction known as oxidation. For example, when iron reacts with oxygen, it forms iron oxide (rust).

III. All metals are solid at room temperature: This is mostly true with the exception of mercury. Mercury is the only metal that is liquid at room temperature. However, since the statement didn't specify "all metals without exception", we can consider this statement as generally true.

Therefore, all three statements are correct.