Final answer:
The answer cannot be determined without knowing the unit price of a single shell. Mathematical problems involving unit price calculations require this information to determine how many items you can purchase with a given amount of money.
Step-by-step explanation:
The question relates to a basic Mathematical problem regarding proportions or unit price calculations. To determine how many shells you can get for $1, we would need to know the price per shell. Unfortunately, the actual price per shell is not provided in the question. Therefore, without additional information regarding the cost per individual shell, it's impossible to accurately answer this question. However, if one of the options given (a) 14, (b) 35, (c) 70, (d) 140 represents the correct number of shells for $1, it is merely a guess without the unit price.
If the unit price was given, the calculation would involve taking the total amount of money you have, which is $1, and dividing it by the cost per shell. For example, if one shell costs $0.05, then dividing $1 by $0.05 would give us the total number of shells that can be bought, which would be 20 shells. Unfortunately, this particular mathematical exercise cannot be completed without the missing information.