Erm, “It's a comment about revenue not turn over”?
First, (a) … really? In which case, please provide your definition of those two terms and explain how they differ! As I understand it (and from wikipedia http://en.wikipedia.org/wiki/Revenue second sentence “In many countries, such as the United Kingdom, revenue is referred to as turnover.”) they are the same thing.
And as for (c), well, I'm pretty sure that's actually also not true, since fruit and veg fall into class i, class ii, and … other?: http://news.bbc.co.uk/1/hi/7724347.stm indicates some relaxation of the rules a while ago, but as far as I know they are still there in some form in the EU, and from some cursory googling similar rules apply in the US, for example, too. There is a difference between apps and fruit, inasmuchas farmers grow fruit in the hope, but not the expectation, that it will all be class i, and then the fruit is graded and sent to several outlets / channels, according to its quality, which is not quite the same as writing apps, but that's because when growing a fruit you don't know whether it will be class i or class ii until it's graded, whereas the decision to grow a class i or class ii app is actively made while it is growing. Apart from that writing apps and growing fruit is basically exactly the same set of operations. But I digress.
I'll go with (b) though, and one out of three ain't bad :)
Footnote: perhaps the same rules that [tesco apple] apply are supposed to ensure that the quality of produce sold in their stores is up to a certain standard, so that shoppers may be confident about the items they purchase, provided those rules are applied carefully. Others, such as [local-grocer android], perhaps do not have, or apply as carefully, such stringent rules, which may or may not lead to a perception, or an actuality, of reduced quality or reliability, which might put shoppers off, causing them to prefer the big rule-based players, even when it might appear that more money is paid for ostensibly the “same” item.