After the transfer of electrons, calcium becomes an ion with a charge of Fill in the blank text field 5 Type here.
and oxygen becomes an ion with a charge of Fill in the blank text field 6
Type here.

goog may have it for you

b is the correct answer

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.