The correct answer is: A. were
The sentence is in the past tense, so the verb “to worry” should be conjugated in the past tense as well. The verb “to worry” is conjugated as follows:
- I worry
- You worry
- He/She/It worries
- We worry
- You worry
- They worry
In the past tense, the verb “to worry” is conjugated as follows:
- I worried
- You worried
- He/She/It worried
- We worried
- You worried
- They worried
In the sentence “My mother, along with others, worried,” the subject is “My mother, along with others.” The verb “to worry” is conjugated in the past tense because the sentence is in the past tense. The correct answer is therefore “were.”
The other options are incorrect because they are not conjugated in the past tense. Option B, “are,” is in the present tense. Option C, “have,” is in the present perfect tense. Option D, “was,” is in the singular past tense.
I hope this explanation is helpful. Please let me know if you have any other questions.