Answer:
subdivide the land
Step-by-step explanation:
The highest and the best use is the option with the best returns. 
Option 1: Selling as a parcel is $450,000
Option 2: 8 plots at $70,000 will fetch
 = 8 x $70,000
 =$560,000
 Site development cost $65,000
 the plots will fetch 560,000 - 65,000= $495,000
The best option is to subdivide the land