A syllabe is stressed when you give it a harder pronunciation than the rest of the syllables in the word, in this case the syllable that is stressed is the second, "Tes", this is where you put the longer emphazise in the word.
The syllable that is stressed in the word "noticeable" is option C. The first syllable. Most of the words with a suffix -able, take the first syllable stress. Every word in the English language only has one stress, and stress can only be put on vowels.
