I can't solve this multi step statistics problem, please help!

The next 4 questions refer to the following situation:

In the last presidential election, before the candidates started their major campaigns, the proportions of registered voters who favored the various candidates were recorded as Republicans 34%, Democrats 38%, and Independents 28%.

After the major campaign began, a random sample of 200 voters showed that 72 favored the Republican candidate; 64 were in favor of the Democratic candidate; and 64 favored the independent candidate. Use the critical value approach, with a 1% level of significance, to determine whether the registered voters' proportions have changed.

Answer the following questions (round to two decimal places):

I. State the alternative hypothesis is.The letter associated with the correct answer is

a) Sample proportions have changed

b) Sample proportions remain the same

c) Population proportions have changed

d) Population proportions remain the same

e)None of the above

II. Determine the critical value for this test.The letter associated with the correct answer is

a) 4.605

b) 5.991

c) 7.378

d) 9.210

e) None of the above

III. Compute the estimate value for this test.The letter associated with the correct answer is

a) 2.50

b) 3.27

c) 12.91

d) 18.42

e)None of the above

IV. The decision and the implications are.The letter associated with the correct answer is

a) Reject the null hypothesis, the proportions remain the same.

b) Reject the null hypothesis, the proportions have changed.

c) Do not reject the null hypothesis, the proportions have change.

d) Do not reject the null hypothesis, the proportion remain the same.

e) None of the above