Correct option is D
Option (d) contains a grammatical error.
The error lies in the verb form "will helped," which incorrectly mixes the modal "will" with the past tense "helped."
The correct form should be "will help," which uses the base form of the verb following the modal verb "will."
Grammatical rule used: When using modal verbs (like will), the main verb must be in its base form.
Example: She will help him tomorrow.