D = {x:x is a factor of 12
​

D={1,2,3,4,6,12}

Step-by-step explanation:

➜1

➜2

➜3

➜4

➜6

➜12

constant acceleration- a

constant velocity- c

no velocity or acceleration- b

explanation:

for body moving with a constant acceleration, the rate of change of displacement changes over time. this is proven by the increasing gradient of the curve (a) against time.

a body that is moving at constant velocity covers equal distances over equal periods of time, thus the straight line with a constant gradient c.

a stationary body   covers no displacement as time elapses. thus the flat line with   zero gradient.

the answer should be a. snail