When adding a suffix that begins with a consonant, the general rule is to

a. drop the last letter of the word and then add the suffix.
b. double the last letter of the word and then add the suffix.
c. add the suffix to the end of the word.
d. change the last letter of the word to y and then add the suffix.

what is the context here? we need to know what story you're talking about : )

a conclusion based on evidence is an example of a. inference

when making an inference, the reader should be sure to support the inference with

evidence

a is an educated guess about what will happen.

c. prediction

when new information proves that a reader's prediction is wrong, the reader should

make a new prediction based on the new information.