There needs to be an apostrophe in the word "shouldn't" in order to make it a valid contraction. This is a contraction of the phrase "should not".
The second error is that the word should be "affect" rather than effect. Affect is usually a verb, and it means <em>to impact or change</em>. Effect is usually a noun, an effect is <em>the result of a change</em>.
<span>C) A “Gift Certificate Box” will not only be a source of joy and laughter for your family, it can also bring your family closer together. </span>
