I would say B because that is an opinion not a fact making it illogical
Though a bit lengthy (which is absolutely fine!) you seem to go into some good detail while withholding main points for the rest of your paper and it is very well done!
A. ewe / yew
b. beach / beech
c. led / lead
d. key / quay
e. plain / plane
f. pain / pane
In colloquial English 'them" would be acceptable
In formal English 'they' is used accompanied by the corresponding auxilliary verb
So, you could also say Is everyone who works in this store as helpful as they are ?