Seven Cells Not Nine

You are moving scooter proximity search onto Uber's H3 grid. You want a cell to average about $0.1\ \text{km}^2$ so a typical cell holds a handful of scooters, and you plan to scan the rider's cell plus one ring of neighbours.

resolution	average cell area
8	$0.737\ \text{km}^2$
9	$0.105\ \text{km}^2$
10	$0.0150\ \text{km}^2$

Which resolution, and how many cells does that one-ring scan cover?

Resolution 10, and 9 cells.

Resolution 9, and 7 cells.

Resolution 9, and 9 cells.

Resolution 8, and 7 cells.