The correct answer is:
In a speech of pros and cons of building a fence around the neighborhood park, the reasons that most that most effectively express the speaker’s viewpoint are:
Effective:
A fence will increase the safety of our children.
Building a fence will protect the park property and equipment.
The cost can be offset of fundraisers such as bake sales and car washes.
Ineffective:
Many neighborhoods nearby have a fence.
The fence will be several feet long.
The fence may be expensive to install.
The speaker needs to adapt his speech in a way that states the advantages of building a park fence, first of all. With this, people are going to be interested in the idea for its benefits and is going to show interest. If he does the opposite, if he starts with the disadvantages, the speech will be ineffective and people will not be interested.