Questions: What changes does the verb construir undergo? a. The yo form replaces the "i" with a "y." b. All forms except nosotros/as and vosotros/as replace the "i" with a "y." c. All forms have a "y" instead of an "i".

The answer is B: All forms except nosotros/as and vosotros/as replace the "i" with a "y".

Explanation:

• Option A: The yo form replaces the "i" with a "y." This is incorrect because the change occurs in more forms than just the yo form.
• Option B: All forms except nosotros/as and vosotros/as replace the "i" with a "y". This is correct. In the present tense, the verb "construir" (to build) undergoes a spelling change where the "i" becomes a "y" in all forms except for the nosotros/as and vosotros/as forms. For example, "yo construyo," "tú construyes," "él/ella/usted construye," "ellos/ellas/ustedes construyen," but "nosotros construimos" and "vosotros construís."
• Option C: All forms have a "y" instead of an "i". This is incorrect because the nosotros/as and vosotros/as forms do not undergo this change and retain the "i" (e.g., "nosotros construimos," "vosotros construís").