Seventeen is the correct answer for this question.
The tendency to remember the first items in the list is called the primacy effect and the tendency to to remember the last items is called the recency effect.
<span>The fact that certain psychological effects appear to shrink over time is called the decline effect.
When something diminishes in power, or shrinks over time (like certain psychological effects in this case), it refers to the decline effect - it means that these is less of something, or it becomes weaker in power.</span>
