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अ, आ, इ, ई, उ, ऊ, ऋ, ए, ऐ, ओ, औ  and अनुस्वार (अं) और विसर्ग (अः) को मिलाकर इनकी कुल संख्या 13 हो जाती है| 

So option (C)

Significant but narrow — concentrated almost entirely in maritime and nautical vocabulary, imported during Peter the Great's reign (late 1600s–early 1700s) when he studied shipbuilding in Zaandam and Amsterdam and then imported Dutch shipwrights, naval terms, and administrative structure wholesale.

Core Dutch loanwords still in everyday Russian:

• матрос (matros) — sailor, from "matroos"
• гавань (gavan') — harbor, from "haven"
• верфь (verf') — shipyard, from "werf"
• флаг (flag) — flag, from "vlag"
• шторм (shtorm) — storm, from "storm"
• каюта (kayuta) — cabin, from "kajuit"
• трюм (tryum) — hold (of a ship), from "ruim"
• боцман (botsman) — boatswain, from "bootsman"
• рейд (reyd) — roadstead, from "rede"
• буксир (buksir) — tugboat, from "boegseren"
• апельсин (apel'sin) — orange (fruit), from "appelsien"
• зонтик (zontik) — umbrella, from "zonnedek" (sun deck — semantic drift, originally meant sunshade)

Outside shipping/navy, the influence is close to zero — no grammar, syntax, or phonology impact, unlike German or French, which shaped Russian elite culture and abstract vocabulary far more broadly (French especially, via 18th–19th century aristocracy).

1. High School English Grammar and Composition
     By Wren and Martin
This is a famous book used since years to learn Good English Grammar.

2. Oxford Modern English Grammar
     By Bas Aarts
This is another good book. This book has both British and American English uses.

3. Cambridge Grammar of English - A Comprehensive Guide
     By Ronald and Micheal
This is one more good book for English Grammar.

Let me tell you, in this age of Internet, there could be many books on English Grammar. But the above mentioned books are used since years for learning Good English Grammar. I am not endorsing them, but they are good book.