Answer:
I tell my students that the answers are unimportant. Working through to a solution becomes a skill that helps a student in life, not just chemistry. That is, a lists of 1 a, 2 b, 3 c, 4 d, etc. helps only the idiot who thinks a list of correct answers means learning.
For example, the first question, "Why are only a few metals found in nature in their pure form, whereas most exist only as ores, which are metal containing compounds? a. Most metals have many valence electrons. b. Metals tend to lose valence electrons easily. c. Metal atoms tend to form bonds with other metal atoms easily. d. Most metal are located on the higher periods of the periodic table.
The first choice 'many valence electrons' applies well to group VII, the halogens, all non metals, so 'a.' is not a good choice. The second choice, 'metals lose electrons easily,' is a property of most metals but the noble metals like gold cause doubt, so lets see if there is a better answer. The third choice, 'metals bond with metals easily,' also true but metallic bonds are not the substance of bonds in compounds. The fourth choice, 'metals are located on the higher periods,' is true enough but gold is right there and so this choice is weak. 'B' is the best choice as the question gives us an out for the rule not having to hold for all metals, just most metals.
This type of analysis models the type of learning your teacher wishes for you. If you don't trust this discussion, just ask your teacher.