The correct answer is option 'C' - Sixteen Personality Factor Questionnaire.

The Sixteen Personality Factor Questionnaire (16PF) is a widely used psychological test that assesses an individual's personality traits. It was developed by psychologist Raymond Cattell in the 1940s and has since been revised and expanded upon.

The 16PF measures personality across sixteen primary factors, which are further divided into secondary factors. These factors include warmth, reasoning, emotional stability, dominance, liveliness, rule-consciousness, social boldness, sensitivity, vigilance, abstractedness, privateness, apprehension, openness to change, self-reliance, perfectionism, and tension.

Career Guidance:
The 16PF has been found extremely useful in career guidance due to its ability to provide insights into an individual's personality traits that are relevant to different occupations. By understanding an individual's strengths, weaknesses, and preferences, career counselors can make more informed recommendations regarding suitable career paths. For example, someone high in dominance and self-reliance may be well-suited for leadership positions, while someone high in sensitivity and social boldness may thrive in customer service roles.

Vocational Exploration:
Vocational exploration involves exploring different career options and identifying one's interests, skills, and values. The 16PF can help individuals gain a deeper understanding of their personality traits and how they align with various career paths. This assessment can provide valuable insights into an individual's vocational interests, preferences, and potential areas of growth.

Occupational Testing:
Occupational testing involves assessing an individual's suitability for a specific job or role. The 16PF can be used to identify personality traits that are desirable for certain occupations. For example, jobs that require high levels of emotional stability and rule-consciousness, such as law enforcement or accounting, may benefit from individuals who score high in those traits. By using the 16PF in occupational testing, employers can make more informed decisions regarding hiring and job placement.

In conclusion, the Sixteen Personality Factor Questionnaire (16PF) is extremely useful in career guidance, vocational exploration, and occupational testing. It provides valuable insights into an individual's personality traits, helping career counselors, individuals, and employers make informed decisions regarding career choices and job suitability.