The correct option is a part as it means Rashma is a pretty girl which makes sense.
When we talk about the other words-
b) Several - Rashma is a several girl. - Doesn't make sense.
c) Some - Rashma is a some girl. - Doesn't make sense.
d) Fairly - Rashma is a fairly girl. - Doesn't make sense.

Answer:

Introduction:
In this question, we are given a statement about Rashma and we need to choose the correct adjective to complete the sentence. The sentence is "Rashma is a ______ girl."

Explanation:
To complete the sentence, we need to choose the adjective that describes Rashma accurately. Let's analyze the given options to determine the best choice:

a) Pretty: This adjective means attractive or pleasing to the eye. It can be used to describe someone's appearance. Since we are talking about Rashma being a girl, it is possible for her to be pretty. Therefore, this option is a valid choice.

b) Several: This adjective means more than two but not many. It is used to indicate a quantity. However, in the given sentence, we are not talking about the number of girls, but rather about Rashma's characteristics. Therefore, this option is not appropriate.

c) Some: This adjective means an unspecified amount or number. It is used to indicate a quantity. Similar to option b, this option is not suitable for describing Rashma.

d) Fairly: This adverb means moderately or reasonably. It is used to describe the degree or extent of something. However, in the given sentence, we need an adjective to describe Rashma, not an adverb. Hence, this option is not the correct choice.

Conclusion:
After analyzing the given options, it is clear that the best choice to complete the sentence is option a) Pretty. This adjective accurately describes Rashma as an attractive or pleasing girl.