Identify the limited topic of the following topic sentence.

"determined birdwatchers will do anything for the chance to spot a rare bird."

a. a rare bird
b. the chance to spot
c. will do anything for the chance to spot a rare bird
d. determined birdwatchers.

The limited topic helps determine and establish the boundaries that the autor or writer is going to tackle under the topic. From the choices, the limited topic of the sentence is letter "A. a rare bird". Since, it was specified that the bird is rare, it would then be easier for readers to get limited to the options of the type of the bird.