According to Standard English conventions, the proper use of commas in this sentence is to separate the listed items. Option B follows the Oxford comma rule, which places a comma before the conjunction "and" in a list of three or more items. This provides clarity and prevents misunderstandings. The other options either lack necessary commas or place them incorrectly, breaking the sentence's flow and making it difficult to read.

In this sentence, commas should be used to separate the different items in the list. Option a does this correctly, using a comma after every item in the list before the conjunction "and". The other options either use the comma incorrectly or do not use the comma at all, which goes against conventional English standards.

According to Standard English conventions, Option C is the correct choice for the proper use of commas in this sentence. Option C correctly uses commas to separate the listed items, maintaining the sentence's readability and flow. The other options either lack commas entirely or place them incorrectly, making it difficult to read and breaking the sentence's structure.

According to Standard English conventions, Option b is the correct choice for the proper use of commas in this sentence. Option A correctly uses commas to list the necessary steps for creating a successful garden. The other options either don't separate the listed items properly with commas or place the commas incorrectly, breaking the sentence's flow and making it difficult to read.

In this sentence, no commas are needed apart from the ones already present in the preceding clauses. Option A reflects this and follows the standard English conventions by not including any additional commas. The other options add unnecessary commas, disrupt the flow of the sentence, and make it difficult to read.