Prethiking : The author concludes that amateur gardeners who use the phases of the moon are less likely to lose plants to a frost. The author also specified in the argument that amateur gardeners who plant during the first warm spell of spring faces problems when a frost follows the warm spell.
From the above information, the author must have assumed that phases of moon are not followed by a frost.
A. Using the phases of the moon usually leads amateur gardeners to plant later in the spring than those planted at the first warm spell.
This option aligns with prethinking. If the phases of moon lead amateur gardeners to plant later in the spring than the first warm spell, then the frost will not affect the plants planted later and amateur gardeners are less likely to lose plants to frost
B. The phases of the moon affect whether a frost follows the first warm spell of spring.
If the phases of the moon affect whether a frost follows the first warm spell of spring, then all the plants get effected by frost and this goes against authors conclusion
INCORRECTC. Amateur gardeners who use the phases of the moon tend to plant different types of plants than do other amateur gardeners.
Unrelated. This option talks about the types of plants while the authors argument is about the season when these plants are planted.
INCORRECTD. Amateur gardeners cannot improve their results unless they understand why their methods work as they do.
Unrelated. This option talks about the working of the planting methods while the authors argument is about the season when these plants are planted.
INCORRECTE. Professional gardeners only rarely plant at the first warm spell of spring.
Talks about professional gardeners while the authors argument is about amateur gardeners.
INCORRECTHence
option A