Explanation

"This is the best peach producing valley" 

Grammatically awkward. It should be:

 "This is the best peach-producing valley."

(Hyphenate "peach-producing" as it's a compound adjective.)

"I done matric in 2010" 

Incorrect verb form. It should be:

"I did matric in 2010"

("Done" is the past participle; here we need the simple past, "did.")

"This is an utensil" 

"An" is used before vowel sounds, not just vowels.

 The correct sentence is: "This is a utensil."

Because "utensil" starts with a 'yoo' sound, which is a consonant sound.

So, since all the options have errors, the correct choice is:

"None of these"