B.
My husband is a biking/racing afficiondo (he has 6 of his own bikes in the garage - plus 2 for me and each of the kids!) So, naturally, we bought a bike trailer. My husband did the research to find out which was the best to buy - the end result was, brand doesn't matter. Look at the trailers - put your kid into/out of them. See which works for you. One word of caution - make sure there is headroom for kids while wearing a helmet (you can get free children's bike helmets at most police stations)! We ended up just buying the Bell that was sold at Costco - it had mesh for aircooling and then also a rain cover (which we never used for rain - only when it got colder out!). Also - consider if you have another child that will be using it. Our trailer was used for both of our kids at the same time. Our kids LOVED the bike trailer and we used ours regularly. So, even though we didn't buy 'top of the line' - it lasted, and we were able to sell it to friends for their son.