Describe some rhetorical techniques the writer uses to establish the speaker’s ethos and indicate what part of that ethos is most important to the writer’s argument. This should be a rhetorical analysis paragraph.

If it’s 15 minutes it would be 159

Psychologists often talk of the magical number "7" - so it is generally assumed that we can keep 7 (more or less, so 5-9 is the correct answer) items in our short term memory - we know this as a result of many experiments.

we can increase this by chunking, so for example "7 8 9 5 3" is harder to remember than "78 95 3" - try it yourself!

the answer is a)