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.

To answer the question, we need to analyze each statement and determine which ones are true for all metals.

Statement I: "All metals lose electrons." This statement is true for all metals, as metals tend to lose electrons and form positive ions.

Statement II: "All metals react with oxygen." This statement is not true for all metals. While many metals do react with oxygen to form metal oxides, there are some metals that are unreactive or have a very slow reaction with oxygen.

Statement III: "All metals are solid at room temperature." This statement is true for all metals. Metals are generally solid at room temperature, with the exception of mercury, which is a liquid.

Based on the analysis of each statement, the correct answer is option D: I, II, and III.