Arranging the words in alphabetical order:
To determine which word comes first in alphabetical order, we need to compare the letters in each word from left to right. Let's analyze each word and arrange them accordingly:

1. Guarantee
2. Group
3. Groan
4. Grotesque

The first letter of each word is:
a) G
b) G
c) G
d) G

Since all four words start with the letter "G," we need to move on to the second letter.

The second letter of each word is:
a) u
b) r
c) r
d) r

Comparing the second letters, "r" comes before "u." Therefore, the correct order so far is:
1. Group
2. Guarantee
3. Groan
4. Grotesque

Moving on to the third letter:

The third letter of each word is:
a) a
b) o
c) o
d) o

Comparing the third letters, "a" comes before "o." Thus, the updated order is:
1. Group
2. Guarantee
3. Groan
4. Grotesque

Finally, let's compare the fourth letter:

The fourth letter of each word is:
a) r
b) u
c) a
d) t

Comparing the fourth letters, "a" comes before "r." Hence, the revised order is:
1. Group
2. Guarantee
3. Groan
4. Grotesque

Choosing the word that comes first:
Now that we have arranged the words in alphabetical order, we can determine the word that comes first. In this case, the word "Group" comes before all the other words. Therefore, the correct answer is option 'b': Group.

Summary:
By comparing the letters in each word from left to right, we arranged the given words in alphabetical order as follows:
1. Group
2. Guarantee
3. Groan
4. Grotesque
The word "Group" comes before all the others, making it the correct answer.