Which sentence uses the word speculate correctly?

Question

Responses

He would have to speculate all night to get ready for the test the next day.
He would have to speculate all night to get ready for the test the next day.

The forecast was unpredictable, so the weatherman could only speculate about how much rain we might get.
The forecast was unpredictable, so the weatherman could only speculate about how much rain we might get.

We remodeled our kitchen with some new speculate countertops.
We remodeled our kitchen with some new speculate countertops.

When he let go of the mower, it began to speculate and spit out smoke.

Answer 1

The sentence that uses the word "speculate" correctly is:

"The forecast was unpredictable, so the weatherman could only speculate about how much rain we might get."

In this context, "speculate" refers to making educated guesses or forming opinions based on limited information, which is appropriate for a weather forecast.