The sailboat with a yellow stripes on its sales drifted across the lake which of the following is the subject of the sentence

A. Sails
B. Sailboat.
C. Lake.
D. Stripes.

B. Sailboat

The subject of the sentence is "sailboat" as it is the noun that performs the action in the sentence (i.e., drifted). Therefore, the correct answer is B. Sailboat.

To determine the subject of a sentence, you need to identify the noun or pronoun that the sentence is about. In this case, the sentence is about something that drifted across the lake.

The subject of the sentence is "sailboat" because it is the noun that the sentence is about. It is the thing that drifted across the lake.

Therefore, the correct answer is B. Sailboat.