Macmoo Real Estate Is Beginning to Use Data-Driven Processes to Determine

Macmoo Real Estate is beginning to use data-driven processes to determine the value that it gets from different marketing activities. Macmoo's website lists available properties and allows customers to request information. Macmoo tends to advertise in local newspapers and specialized real estate periodicals. The marketing director believes that Macmoo's traditional spring advertising campaign, which runs during the month of March, is an effective use of advertising resources. When pressed for evidence, the marketing director points out that revenues in March have consistently been higher than revenues in February.
Which of the following, if true about the real estate industry in general, would weaken the marketing director's argument?
The demand for houses is higher than it was last year.
The supply of houses for sale is lower than it was last year.
Sales are generally higher in March than in February.
Sales are generally higher in April than in March.
In February, home loan interest rates dropped.