Definition: You are given a question on elementary mathematics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: Umi created the number pattern that follows by adding the same amount each time to get the next number. 20, 40, 60, 80, ... What will be the eighth number in the pattern?
(A)160 (B)240 (C)320 (D)640

A