Who’s Available tonight to talk or does anyone need help with their school work still

I really really REALLY NEED HELP ON A QUESTION! Here it is, please help :(

Which structure likely would fail the fastest from the effects of corrosion?

Select one:

A car in the prairies

A boat in a freshwater lake

The hull of an ocean ship

A nail on a building in the desert

Suspension bridges often are used on roads across large bodies of water. How does the concrete bridge deck affect the bridge?

Select one:

The concrete bridge deck adds to the live load on the bridge

The concrete bridge deck adds to the dynamic load on the bridge

The concrete bridge deck adds to the static load on the bridge

The concrete bridge deck adds to the centre of gravity on the bridge

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.