The term Blue Line is associated with which of the following games?

Correct — A. A blue line is a marking on an ice hockey rink, and it belongs to no other sport in this set.

Two blue lines cut the rink into three zones — defending, neutral and attacking. They are the reference for the offside call: an attacking player may not cross the opponents' blue line before the puck does.

That single rule is what the line exists for, and it makes the rest of the zone play work — option (a).

Why the others are wrong

• (b)
  Cricket — Cricket's markings are the popping, bowling and return creases at each end, plus the boundary. The game has no coloured zone line.
• (c)
  Football — Football marks a halfway line, a centre circle, a penalty area and a goal area. Its offside is judged against the second-last defender, not against a painted line.
• (d)
  Table Tennis — Table tennis marks a white centre line that matters only for doubles service, together with the side and end lines. No marking in the game is called a blue line.

An ice hockey rink is divided lengthwise by lines, and each line carries a rule.

The two blue lines create the defending, neutral and attacking zones. The red centre line sits midway between them. Offside is judged at the attacking blue line, and icing is judged from the centre red line.

Because the game is fast and continuous, these fixed lines are how officials make instant judgements without stopping play, which is why the terminology is so tightly bound to the sport that a term like 'blue line' identifies it on its own.

Key facts

• An ice hockey rink carries two blue lines, splitting it into defending, neutral and attacking zones.
• The blue line decides offside: an attacker may not enter the attacking zone ahead of the puck.
• The red centre line runs midway between the two blue lines and is used to judge icing.
• A team has five skaters and a goaltender on the ice at a time.

Common traps

• Answering football because offside brings a line to mind, when football's offside has no painted line.
• Confusing the blue line with the red centre line, which governs icing rather than offside.

No directly related past PYQ was found.