Correct Answer: catastrophe

Solution : The correct choice is the second option.

Explanation: In the given sentence, the term "global education crisis" suggests a severe and far-reaching negative event. The word "catastrophe" aligns with this meaning, as it refers to a sudden and widespread disaster or calamity.

So, the correct sentence would be: "The COVID-19 outbreak has caused a global education catastrophe ."

The meanings of the other options are as follows:

1. Legacy: Legacy refers to something handed down from the past, often with positive connotations.
2. Inhibition: Inhibition refers to a restraint or hindrance, usually in the context of behaviour.
3. Hoard: Hoard refers to a stock or store of something, typically accumulated for future use.