Grateful is the best tone that describes the sentence.
"Thank you for all the help! we wouldn't have gotten such a good grade without your guidance."
This is a feeling of being grateful to someone because they have given you something or have done something for you.
The Oxford Dictionary defines the word grateful as “showing an appreciation of kindness.”
Tone is an individual way of speaking or writing especially when used to express an emotion.
Tone is the speaker's attitude toward his subject.
A complete sentence must have, at minimum, three things:
The subject is typically a noun or a pronoun. And, if there's a subject, there's bound to be a verb because all verbs need a subject. Finally, the object of a sentence is the thing that's being acted upon by the subject.
Hence, the correct option is B
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