Which statement about the acceleration of an object is correct?
a. the acceleration of an object is directly proportional to the net external force acting on the object and
inversely proportional to the mass of the object.
b. the acceleration of an object is directly proportional to the net external force acting on the object and
directly proportional to the mass of the object.
c. the acceleration of an object is inversely proportional to the net external force acting on the object and
inversely proportional to the mass of the object.
d. the acceleration of an object is inversely proportional to the net external force acting on the object and
directly proportional to the mass of the object.
select the best answer from the choices provided

Ithink your answer is d

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

Sorry i don’t know what to do