Directions: In the question below, a situation is given, followed by statements that may or may not be possible reasons for the situation. Select the option that best describes the reason for the situation in the question. 

Situation: Drugs giant Pfizer has said it expects $15bn (≤11bn) of sales this year of the coronavirus vaccine it developed with German firm BioNTech. The vaccine was one of the first to be authorized for use by countries including the UK and the US. 

I. In England, around 28 million eligible individuals are yet to be vaccinated - around two-thirds of the population

II. Many countries around the world have been scrambling to vaccinate their populations in a bid to save lives and aid economic recovery.

III. Within age groups, the NHS is trying to ensure that all people, regardless of deprivation, geography, or ethnicity, have equal uptake of the vaccine.