Which of the following refers to a meter?

get rid of questions like this, ambiguity isn't sporting!!

Poor question with an even poorer answer. Meter/Metre it makes a difference.

"Linear meters or linear meters...???" Except for the first 'linear' being capitalized, what's the difference?

If it was spelt correctly I.e. metre (a word of french origin) then no more ambiguity. Please , please my American friends, if you ever come to your senses and join the rest of the world making life easy with a decimal system, including temperature, spell it properly.

Sheriffe, In the US, it’s spelled meter. Sorry! We’re so lame. We only use metrics in schools, and it doesn’t stick. I like the metric system for a lot of reasons. One is that I’m only about 15 kg overweight. That seems pretty manageable.

I picked the right answer because I couldn’t make any sense out of the others. But what?!

A linear metre is a term primarily used in the building industry. It's often used to quantify and price materials by their length in a single direction, including roofing, timber, flooring products and cabling. 1 linear metre is the equivalent of 1 standard metre, or 100 cm (39.37 inches). Linear" means you are measuring a one-dimensional line, not an area in square meters or a volume in cubic meters. The adjective is superfluous. ???