What would be the most efficient step to suggest to a student attempting to complete this problem?

Factor:

${x}^{2}(2a+5)x+({a}^{2}+5a+6)$

a)Distribute (2a+5)

b)Factor in the form (x+c)(x+d)

c)Simplify and group terms with a

Factor:

a)Distribute (2a+5)

b)Factor in the form (x+c)(x+d)

c)Simplify and group terms with a