Final answer:
Nell Williams co-founded Life Chiropractic College West with Sid Williams in the year 1976, which makes option A the correct answer.
Step-by-step explanation:
The co-founder of Life Chiropractic College West (Life West) alongside Sid Williams was Nell Williams. The correct year that the college was co-founded is 1976. Hence, the appropriate answer to the question 'Who co-founded Life West College with Sid Williams and in what year?' is option A) Nell Williams in 1976.