Choose the answer with the correct grammar and punctuation.

Question 4 options:

With machetes, the explorers cut their way through the tall grasses to the edge of the canyon. Then they began to lay out the tapes for the survey.

With machetes, the explorers cut their way through the tall grasses to the edge of the canyon, then they began to lay out the tapes for the survey.

With machetes, the explorers cut their way through the tall grasses to the edge of the canyon then they began to lay out the tapes for the survey.

With machetes, the explorer cut their way, through the tall grasses, to the edge of the canyon, then they began to lay out the tapes for the survey.

And you think the correct one is … ?

With machetes, the explorers cut their way through the tall grasses to the edge of the canyon. Then they began to lay out the tapes for the survey.

The answer with the correct grammar and punctuation is:

"With machetes, the explorers cut their way through the tall grasses to the edge of the canyon. Then they began to lay out the tapes for the survey."

This sentence uses proper punctuation by placing a period after "canyon" to indicate the end of the first sentence, followed by a capitalized "Then" to begin the second sentence.