Line graphs show how values change over time, and the slope of the line reveals the direction of those changes. If the values rise from 2018 to 2020, the line moves upward, signaling a rising trend or growth over that period. This interpretation fits best because it captures the overall upward movement across the years, rather than suggesting no change, random ups and downs, or a decline. A flat line would mean no change, fluctuations with no clear direction would show a mix of ups and downs, and a downward slope would indicate a decrease.

Understanding how yards relate to interlockings in a rail network helps with this question. An interlocking directs trains safely at a junction, and nearby yards are named for the streets or lines they serve. The yard that carries the Johnson Avenue name is the one positioned on the west side of the Johnson Ave interlocking, making it the correct match for “located west of” that interlocking. The other yards are associated with different areas or lines and don’t describe a westward location relative to this interlocking, so they don’t fit the specified relationship. If you check a yard map, you’ll see Johnson Avenue Yard on the west side of the Johnson Ave interlocking, which confirms why it is the right choice.

Understanding how station signs direct you to important operations spaces helps you locate where the Westbound Wheelhouse is. The “W/B” in the sign stands for Westbound, and the wheelhouse is the control space that oversees westbound train movements. At Jamaica station, this sign is placed at the west end of platform B, which is the side facing the westbound tracks. That positioning makes it the closest and most practical place to monitor and coordinate westbound trains. The east end of platform B would serve the opposite direction, and platform E’s ends are associated with other track configurations, so they aren’t where this particular wheelhouse is located.

Signal indications controlled by the Joint Control Centre after permission mean you must obtain authorization from JCC before the signals will allow movement. Aster yard fits this because its signals are governed by JCC once permission is given. The other yards rely on local control or different procedures, so they don’t involve JCC-directed indications after permission.