Answer:
B). Shovel.
Step-by-step explanation:
Tone is usually referred to as the author's approach towards a particular subject matter which is mirrored by writing style of the author. It determines how the readers grasp, perceive or respond to a particular text. The tone could be humorous or sincere, formal or casual, etc. that assists the author to convey his/her central claim, idea, or message. As per the question, the word that proposes an informal tone to the given sentence is option B, i.e. 'shovel' as it offers a personal tone which includes the author as a part of the description. Thus, the answer is option B.