Mega shine, a phone brand has two categories of phones

Mega shine, a phone brand has two categories of phones. College students buy phones that typically cost less and last long; however, once students graduate and enter a professional environment, they buy from the premium category in which the phones cost more and are delicate. Mega shine makes a smaller profit per phone bought by college students than bought by professionals. Last year Mega shine’s profits from phones were substantially higher than the previous year; however, roughly the same number of phones were sold, and the prices and profit margins of each phone that Mega shine sells remained unchanged.

If the statements above are true, which of the following is most strongly supported by them?

A. The proportion of people buying the phone, who also bought the other accessories such as screen protector and headphones on which Mega shine has a high profit margin, was larger last year than the previous year.

B. Mega shine’s manufacturing costs for its phones were lower last year then they had been the previous year.

C. Of all the Mega shine phone buyers, the proportion of professional buyers owning more than one phone was greater last year than the previous year.

D. Mega shine made several advancements in its phone technology last year, making Mega shine phones more appealing to the buyers.

E. The proportion of Mega shine phones bought by professionals was higher last year than the previous year.