The correct answer is (C) To trespass; to intrude upon the property, domain, or rights of another, esp. stealthily or by gradual advances; to advance beyond the proper limits of what belongs to one or is due to one. To gradually take more control over another's possessions, time.

Encroach comes from Middle English encrochen, Old French encrochier (to seize, to catch with a hook).

Examples of use:

• My neighbor's fence encroaches on my property. Television began to encroach on radio in the late 1940s.
• Recently passed legislation encroaches on the rights of the individual.