English proves to be a problem for Mr. and Mrs. Yang

This sentence focuses on the fact that English is a challenge for Mr. and Mrs. Yang. The correct verb form needs to agree with the subject 'English'. Here's why 'proves' is the right answer:

• Subject-Verb Agreement: The subject 'English' is singular, so the verb needs to be in the singular form. 'Proves' is the singular present tense form of the verb 'prove'.

Let's look at why the other options are incorrect:

• likely: This is an adjective, not a verb.
• objective: This is a noun, not a verb.
• apply(applies)for: This phrase refers to making a request for something and doesn't fit the context.
• go(es) over: This phrase means to review or examine, and it doesn't make sense in this sentence.

Therefore, the correct answer is 'proves' because it's the singular present tense form of the verb 'prove' and correctly agrees with the subject 'English'.