Firstly, make an extra column next to the pulse column.
The best way to solve this question is to find the difference between systole and diastole for each of the readings and write the differences in the extra column.
A lot of the candidates would often think that it should be highest systole pressure – diastole pressure. This is often risky as the number of results given in the table is very high and you can never be sure whether the formula of (highest systole pressure – diastole pressure) would work.
The answer is F. A pulse of 86 was taken when the systole was 149 and diastole was 81.