材料：What advantages does the eye have over the radar ？The eye has the following advantage

Sensitive to color

Can assess heading

Can identify small targets

Can see light configurations

Can assess ship types

Can identify conspicuous marks

Can identify flashing lights Has better discrimination

Can see changing weather patterns

Can see effect of sea on vessel

Not affected by blind arcs (if observer moves)．

问题： BLIND ARCS mean ______ ．

A.the arcs from which one can not see certain objects

B.the arcs which are blind

C.the black arcs

D.the arcs from which one can see certain objects

This paragraph is a ______ ．A.a clause of a contract

B.an explanation of advantage of eyes over radar

C.a requirement from a government

D.an article of Colreg

DISCRIMINATION means the ______ ．A.provision

B.dimension

C.distinction

D.permission

The eye is more ______ than radar．A.distinguishable

B.reasonable

C.controllable

D.reliable

请帮忙给出每个问题的正确答案和分析，谢谢！