Sublimation happens when heat
increases in a solid, and the
a. particles move so slowly that they stay a solid.
b. particles move so fast that they become a gas.
c. particles do not move or make a phase
change.
d. particles become a liquid and then change to a
gas.

The answer is B. Frost turning into steam, for example.

you didn't give any options but heres what i can tell you: an inference is likely to change based on additional observations. the latter is something that you have seen or sensed using your sensory organs while the former is like a conclusion out from what you have observed.