Final answer:
The answer to the riddle is 'Detergent,' an 11-letter word that phonetically sounds like 'hit the ground' but actually refers to a cleaning substance.
Step-by-step explanation:
The riddle you've presented asks for an 11-letter word that sounds like it could mean 'hit the ground,' but in fact refers to something else. The correct answer is B) Detergent. While 'detergent' doesn't mean something hitting the ground, it phonetically sounds similar to 'hit the ground' when said quickly. This type of wordplay is common in riddles where the sound of the word can mislead you to think of a different meaning.