You are given a short paragraph, a question and two choices to answer from. Choose the correct answer based on the paragraph and write the answer(not the key).

Paragraph: With a higher concentration of hydrogen ions, a solution is more acidic but has a lower pH.
 Question: Eric measures 20 hydrogen ions per 100ml in one solution. Another solution has 30 hydrogen ions per 100ml. The solution with less hydrogen ions is _____ acidic. 
 Choices: A)more 
B)less
less