The politician has a large (amount, number) of supporters.

a. amount

b. number

I would say Number.
I just need a heads up..

I agree with "number" -- because "supporters" is a count noun.

http://grammar.ccc.commnet.edu/grammar/noncount.htm

it's number.

You are correct, the correct answer is "number" in this context.

The word "amount" is typically used when referring to non-countable or unquantifiable nouns, such as "amount of money" or "amount of time." On the other hand, the word "number" is generally used when referring to countable or quantifiable nouns, such as "number of supporters" or "number of people."

To determine the correct choice between "amount" and "number," you can follow these steps:

1. Identify the type of noun being referred to. Is it a countable noun (e.g., supporters, people) or an uncountable noun (e.g., money, time)?

2. If the noun is countable, use "number." If the noun is uncountable, use "amount."

In the given sentence, "supporters" is a countable noun, so we use the term "number." Therefore, the politician has a large number of supporters.