Which statement does einstein’s theory promote about space and time? (a) time, space, and the speed of light depend on reference frames.(b) time and space depend on reference frames, but the speed of light does not.(c) the speeds of light and space depend on reference frames, but time does not.(d) the speeds of light and time depend on reference frames, but space does not.

(B) Time and space depend on reference frames, but the speed of light does not.

This theory is also known as General Relativity and explains that spacetime is curved when there is gravity, matter, energy, and momentum.  

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.