What is the relationship between iambic pentameter and blank verse?
iambic pentameter is a form of blank verse.
blank verse is a form of verse that uses iambic pentameter.
both blank verse and iambic pentameter are types of prose.
blank verse is a type of verse, while iambic pentameter is a type of prose.

Blank verse is a form of verse that uses iambic pentameter. That is the relationship that exists between iambic pentameter and blank verse.

Blank verse is poetry that is generally written in iambic pentameter, which is the most common type of metric line, at least in English poetry. In that way, iambic pentameter is closely related to rhythm. One of the most important characteristics of blank verse poetry is that it does not have a fixed number of lines; therefore, it is mainly used in dramatic monologues. Famous writers such as William Shakespeare and John Keats resorted to blank verse in their works.

the correct answer would be:  

a. adverb phrase

the pronoun reference replaces a noun, but you have to make sure there's no room for confusion.

in the first sentence "her" could be referring to shely or to the sister. the answer there is "shelly called her sister and told her about the new baby."

in the second sentence "it" could be referring to the roof or the floor. the answer there is "since the roof leaks on the family room floor, we need to repair the roof."