Please help I have less than 10 mins.

Determine whether the underlined --> () phrase or clause in each sentence is restrictive or nonrestrictive.

1) Lighting (that strikes in dry forest) can cause forest fires.

ARestrictive; no commas needed
BNonrestrictive; commas are needed

2) Often thunderstorms produce lightning (that ignites wet areas).

ARestrictive; no commas needed
BNonrestrictive; commas are needed

3) Lighting (which occurs all over the world) is an amazing phenomenon.

ARestrictive; no commas needed
BNonrestrictive; commas are needed

4) Thunder (can be quite loud) follows a lighting crash.

ARestrictive; no commas needed
BNonrestrictive; commas are needed

5) A bolt of lightning (striking a person) usually causes very serious injury or death.

ARestrictive; no commas needed
BNonrestrictive; commas are needed

The information about striking in a dry forest is necessary for the rest of the sentence. If the lightning struck a lake, it wouldn't cause a forest fire. This specificity of where the lightning strikes is key.

2. A. Restrictive

This information is key because the lightning is so powerful it can even ignite areas that are damp due to rainfall.

3. B. Nonrestrictive

The information that lightning occurs all over the world has no bearing on whether or not is is an amazing phenomenon. This is extra information which can be left out.

4. B. Nonrestrictive

The volume of the thunder is not imperative information to whether or not it follows after lightning. The level of noise is extra information.

5. A. Restrictive

The information about the lightning actually making contact with a person is key for the rest of the sentence. The lightning just occurring may not result in serious injury or death. However, a person actually being struck will usually end up in injury or death.