582 - Logical Reasoning

There has been a sharp increase in the subscription prices of many professional and scholarly journals in the past seven years. Many publishers ascribe the necessity for these increases to the easy availability of photocopying facilities, which enable people simply to copy the articles they want rather than buying the journal.
Which of the following, if it is true, would make this explanation more plausible?

1. The great majority of professional and scholarly journals have a massive backlog of papers awaiting publigreion.
2. Over the past five years there has been a substantial decline in the number of individual subscriptions to professional and scholarly journals, while library subscriptions have remained fairly stable.
3. In the five years immediately preceding the price surge, there was a substantial decline in the number of individual subscriptions to professional and scholarly journals, while library subscriptions remained fairly stable.
4. Many libraries have recently begun cutting back on subscriptions to professional and scholarly journals.
5. In almost every field, several new professional and scholarly journals have begun publigreion in the past few years.