Final answer:
The greatest whole number divisor of 28 from the given options is 14, hence, Ian and Isagani could each catch A)14 fish per hour.
Step-by-step explanation:
The question asks for the greatest number of fish Ian and Isagani could catch per hour, given that Ian caught 28 fish. To answer this, we should look for the highest divisor of 28 that could represent the number of fish caught per hour, which in this case should be a whole number. The options provided are 14, 7, 4, and 2.
The highest whole number that can be a divisor of 28 from the options is 14. Therefore, if Ian and Isagani caught the same number of fish per hour, and Ian caught a total of 28 fish, the greatest number of fish they could catch per hour is 14 each, making the answer A) 14.