Parts of the following sentence have been given as options. Select the option that contains a spelling error.
My strength is as the strenght of ten because my heart is pure.

To find the option that contains a spelling error, let us examine the spelling of the words in each given segment of the sentence: "My strength is as the strenght of ten because my heart is pure."

1. "my heart is pure": All words ("my", "heart", "is", "pure") are spelled correctly.
2. "My strength is": All words ("My", "strength", "is") are spelled correctly. Note that the noun "strength" is spelled correctly here (s-t-r-e-n-g-t-h).
3. "as the strenght": The word "strenght" is misspelled. The correct spelling is strength, where the letter 't' precedes the 'h' at the end.
4. "of ten because": All words ("of", "ten", "because") are spelled correctly.

Therefore, the option containing the spelling error is "as the strenght".

The correct answer is as the strenght.