Metals that are excellent conductors have electrons that are
а.
difficult to loosen and difficult to move
difficult to loosen but easy to move
easy to loosen but difficult to move
d.
easy to loosen and easy to move

The correct answer is  B difficult to lose but easy to move.

Explanation:

Metals are chemical substances in which the electrons of the outer orbital or valence orbital are hold very tightly through intramolecular attraction  by the nucleus present in the center of the atom of the metal.As a result it is very difficult to remove electron from the valence orbital of metal.

    As electrons are hold very tightly by the nucleus of a metal,the electrons are present in very compact manner within metal which helps metal to be an excellent conductor.

indicate valleys, hills, steepness and gentleness of slopes.

explanation:

contour lines on a map indicate elevation, or depth. numeric notations on contour lines refer to the level of elevation, or height about sea level.