Which of the following is most likely to result from an increase in the dividend tax credit?

a$)$ A decline in unit price of mutual funds that focus on investing in preferred shares.

b$)$ A decrease in income of all the retired Canadians who own preferred shares.

c$)$ An increase in the proportion of total Canadian taxes that are paid from investment income.

d$)$ An increase in prices of Canadian dividend$-$paying shares because they will have a lower effective rate rate which makes them more attractive investments.