The given question asks you to identify what number the word '50' refers to from a list of options.
50 is the numeral representation of the English word 'fifty.'
Let's look at the options given:
(a) Fivety - This is not a correct spelling in English.
(b) Fifteen - This corresponds to the numeral 15, not 50.
(c) Fifty - This is the correct English word for the numeral 50.
(d) Five - This corresponds to the numeral 5, not 50.
The correct answer is (c) Fifty .
The word 'fifty' is made up of the base number 'five' with a modification, as numbers ending in a 'y' have a transformation from the second digit onward. It is important to learn these names as they are frequently used in everyday English and are foundational for understanding larger numbers efficiently.