Which of these sentences is correctly written?
a.
it's difficult to predict the effects of new policys and procedures.
b.
it’s difficult to predict the effects of new policies and procedures.
c.
its difficult predict the affects of new policys and procedures.
d.
it’s difficult predict the affects of new policies and procedures.

The sentences that are correctly written are:

A sentence is a group of words which has a verb and a predicate and can be make a meaning.

For a sentence to be correct, then it must obey the rules of concord which says that a verb must agree with its subject in number and quantity.

As a result of this, the correct sentence from the given list is option B. This is because the verb agrees with the subject and the words "effects" and "policies" are in agreement.

Therefore, the correct answer is option B

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B. It’s difficult to predict the effects of new policies and procedures.

Explanation:

A. It's difficult to predict the effects of new policys and procedures. (policys is misspelled)

B. It’s difficult to predict the effects of new policies and procedures. (correct)

C. Its difficult predict the affects of new policys and procedures. (Its needs to be It's)

D. It’s difficult predict the affects of new policies and procedures. (affect needs to be effect because affect means to have an impact on, while effect is the result)