Final answer:
A large vocabulary enhances understanding of concepts and associations of words, contributing to comprehensive language skills. Statements c) and d) are valid reasons to support the argument that a large vocabulary is beneficial.
Step-by-step explanation:
The benefits of having a large vocabulary include the ability to understand not only the basic definitions of words but also the intricate concepts and associations a word represents. This understanding aids in deeper comprehension of written and spoken language. While a large vocabulary itself might not guarantee perfect spelling, it does contribute to greater language proficiency, allowing for more nuanced expression and comprehension.
Statement a) is misleading because while vocabulary and grammar are related, knowing many definitions is not a requisite for understanding grammar rules. Statement b) has a grain of truth but is not universally accurate; a large vocabulary doesn't inherently lead to spelling proficiency. Statement c) is valid because understanding the full range of a word's meaning is useful. Finally, statement d) is also valid as it correctly suggests that readers with a large vocabulary are able to understand the deep associations words can evoke.