Question

Grasses and mosses sprout in Alaska’s tundra in summer when _____.

A. the soil is fertile

B. rainfall is adequate

C. the top layer of soil freezes

B. the top layer of soil thaws

Answer 1

Grasses and mosses sprout in Alaska’s tundra in summer when _____.

the top layer of soil thaws

Answer 2

I think it's B. The top layer of soil thaws.