Question

read the text.
in curling, players use brooms to maneuver a giant stone to the center of a bulls - eye. historically, the brooms were made from natural fibers, but that has changed in recent years. a broom made with artificial materials, dubbed the \frankenbroom,\ gave players more control over the stone—too much control, according to fifty of the top curling teams. as a result of the controversy, frankenbrooms were banned in 2015. however, other brooms have also raised concerns. for this reason, canadas world curling federation (wcf) and the national research council of canada (nrc) joined forces to measure how different brooms affect the stone and the ice.
match causes with their effects.
frankenbrooms caused controversy.
other brooms were questioned.
cause
effect
officials banned the brooms.
the wcf and nrc tested the brooms.

Explanation:

The text states that "As a result of the controversy, Frankenbrooms were banned in 2015." So for the cause "Frankenbrooms caused controversy", the effect is "Officials banned the brooms".
Also, it says "However, other brooms have also raised concerns. For this reason, Canada's World Curling Federation (WCF) and the National Research Council of Canada (NRC) joined forces to measure how different brooms affect the stone and the ice." So for the cause "Other brooms were questioned", the effect is "The WCF and NRC tested the brooms".

Answer:

Frankenbrooms caused controversy - Officials banned the brooms.
Other brooms were questioned - The WCF and NRC tested the brooms.