Question

studies of venus have shown that the entire planet was resurfaced with new sediment relatively recently, between 300 and 500 million years ________ explanation proposes that since venus does not have tectonic plates like earth, it goes through a cycle where heat builds up in the core of the planet until it bursts, covering the entire planet in lava all at once. which choice completes the text so that it conforms to the conventions of standard english? a ago, one b ago. one c ago and one d ago, while one

Explanation:

The first - part of the sentence is a complete thought about the resurfacing of Venus. A period is needed to end this independent clause. Then, the next part starts a new statement about an explanation.

Answer:

B. ago. One