Acceleration always refers to a(n) a change in speed,
b increase in speed.
с change in direction,
d change in velocity.
Please help this is urgent

Non metal is an element or substance that is not a metal metal is a solid material that is typically hard, shiny, malleable, fusible, and ductile, with good electrical and thermal conductivitymetalloid is an element (e.g., germanium or silicon) whose properties are intermediate between those of metals and solid nonmetals. they are electrical semiconductors.