Answer:
a) first of all, in order for a company to repurchase their stock they must have extra cash available that will not be used for financing either existing or future projects. Also, corporations tend to repurchase stocks when they believe that their market price is too low (or lower than their own calculations). When corporations start to repurchase stocks, generally the market price tends to increase.
b) since treasury stocks decrease the company's total outstanding stocks, the earnings per share will increase. EPS = (net income - preferred dividends) / weighted average outstanding common stocks. If the denominator decreases, then the total result should increase.
c) the information is missing, so there is no way to calculate the debt to assets ratio. But if we analyze the formula:
debt to assets ratio = total debt / total assets
when equity decreases (treasury stocks decrease equity), total assets will also decrease, but debt remains the same. Therefore, an increase in treasury stocks will result in a higher debt to assets ratio which means that the company's risk is higher than before.