IMO C.
Here are a few concepts on Ground For/In/On/To:
grounds for something - the basis or cause for legal action such as a lawsuit. (*Typically: be ~ become ∼.). Example -
1. Your negligence is grounds for a lawsuit.
2. Is infidelity grounds for divorce in this state?
ground someone in something - to instruct someone in an area of knowledge.
Example –
1. We grounded all our children in the basics of home cooking.
2. We were all grounded in basic cooking by the time we were six.
ground something on something - to build a firm basis for something on something else.
Example –
1. He grounded his thinking on his detailed research.
2. His thinking was grounded on years of reading.
3. My house had in the meanwhile been shingled down to the ground on every side.
ground to somebody/something - to fail to maintain a share of something compared to others; Opposite of: gain ground on somebody/something.
Example –
1. Good Mexican restaurants are losing ground to less expensive, more informal places that have opened all over the city.
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