What is the minimum contiguous acreage required for farmland eligibility for registration?

The correct choice is 5 contiguous acres, as this is the minimum acreage requirement set for farmland eligibility for registration in many jurisdictions, including Maine. This threshold is established to ensure that the land can support agricultural activities and is a manageable size for a farmer to sustain farming operations. Generally, smaller plots can still be viable for certain types of farming, thus allowing more landowners the opportunity to participate in agricultural programs or secure benefits.

The other options present larger minimum acreage requirements which may not be feasible or necessary for smaller-scale farming operations or those just starting with agriculture. This consideration of allowing smaller plots acknowledges the diverse nature of farming practices and the variety of crops and livestock that can be managed on smaller pieces of land.