Explanation:

- Option 1: suggests

- "Suggests" is singular, typically used with singular nouns. The word “patterns” is plural, so “suggests” is incorrect.

- Option 2: has suggested

- "Has suggested" is in the present perfect tense. This implies a completed action that has relevance now. It's not fitting for simple predictions or current trends.

- Option 3: suggest

- "Suggest" is the correct verb form to use with the plural noun "patterns." This is appropriate for a present tense statement with a plural subject.

- Option 4: have been suggested

- "Have been suggested" implies that someone or something else made the suggestion, not fitting in this context.